Image processing method and apparatus

ABSTRACT

An image processing system for receiving a coded record information in units of pages for use with a recording head includes a method and apparatus for (1) analyzing the received coded record information to derive a minimum band number and a maximum band number of a band in which an object image represented by the coded record information exists, the band having a height which is an integer multiple of a height of the record head, (2) storing the derived minimum band number and the maximum band number for each object image, (3) comparing the stored minimum band number and the maximum band number with a current band number to obtain a comparison result, and (4) determining, in response to the obtained comparison result, whether the object image is to be developed into dot data in the band.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an image processing method andapparatus, which can perform a color print operation of characters,figures, raster images, and the like on the basis of print data,commands, and the like supplied from a host computer.

2. Related Background Art

FIG. 1 shows an example of a coordinate system (to be referred to as auser coordinate system hereinafter) serving as a reference forcoordinate points to be designated when figures, characters, and thelike are drawn using a PDL (Page Description Language) or pagedescription commands.

A hatched rectangular portion indicates an effective print area (adrawing enable area in a sheet). As shown in FIG. 1, the length of theeffective print area will be referred to as an effective print areaheight hereinafter, and the width of the effective print area will bereferred to as an effective print area width hereinafter.

The coordinate system shown in FIG. 1 is a two-dimensional x-yorthogonal coordinate system, and as an origin as the lower left cornerof the effective print area, as shown in FIG. 1.

Any coordinate unit (e.g., 0.01 mm or 1/72 inch) can be arbitrarily setin this coordinate system.

Description elements of the PDL and page description commands for, e.g.,figure drawing, which are set on the basis of the above-mentioned usercoordinate system, are analyzed in an image processing apparatus in thereception order, and are converted into information to be developed ontoa memory.

FIG. 2 shows an example of a coordinate system (to be referred to as aprinter coordinate system hereinafter) serving as a reference when theabove-mentioned memory development information is generated.

The coordinate unit of this coordinate system is determined by theresolution of an image processing apparatus (for example, when theresolution is 300 dpi, the coordinate unit is 1/300 inch).

A hatched rectangular portion is the same as the effective print areashown in FIG. 1.

This coordinate system is a two-dimensional x-y orthogonal coordinatesystem, and has an origin as the upper left corner of the effectiveprint area.

FIG. 3 shows an example of a memory map of an internal RAM area in aconventional image processing apparatus for performing a color printoperation on the basis of the PDL or page description commands.

The RAM area is constituted by a system work memory, a reserved area,and page development memories (each having a size corresponding to theeffective print area shown in FIG. 2) for Y (yellow), M (magenta), C(cyan), and Bk (black) as coloring agents (toners or inks).

The system work memory is used as a storage area of information (e.g.,variables) used in control in the image processing apparatus, and apermanent work area.

The reserved area is used as an area for storing memory developmentinformation, a character cache memory, and the like.

FIG. 4 shows an example of a line color designation command of drawingattribute designation commands.

This command is used for designating a color of a line or an outline ofa figure.

A command No. varies depending on the drawing attribute designationcommands, and is used for identifying each command function.

The content of a number-of-data parameter indicates the number of datainput after the number-of-data parameter.

In this case, the content of the number-of-data parameter of the linecolor designation command is 4.

Y-, M-, C-, and Bk-values respectively indicate density data values of Y(yellow), M (magenta), C (cyan), and Bk (black) as primary colors ofcoloring agents.

FIG. 5 shows an example of a circle drawing command of drawing commands.

A command No. varies depending on the drawing attribute designationcommands, and is used for identifying each command function.

The content of a number-of-data parameter indicates the number of datainput after the number-of-data parameter.

In this case, the content of the number-of-data parameter of the circledrawing command is 3.

The x- and y-coordinates of the center are those on the user coordinatesystem.

An actual radius is calculated by multiplying a coordinate unit of theuser coordinate system with a "radius" value.

FIG. 6 shows an example of memory development information generated byanalyzing the line color designation command shown in FIG. 4.

A command table No. is used for identifying each memory developmentinformation. Other parameters are the same as those in FIG. 4.

FIG. 7 shows an example of memory development information generated byanalyzing the circle drawing command shown in FIG. 5.

A command table No. is used for identifying each memory developmentinformation. Values xc and yc represent the coordinates of the center ofa circle on the printer coordinate system.

A value r represents a radius value converted to have the resolution ofthe image processing apparatus as a unit.

FIG. 8 shows a case wherein on the user coordinate system shown in FIG.1, the coordinate unit is set to be 1 mm, and drawing of a circle havingcoordinates (150, 150) of the center and a radius of 50 is set.

FIG. 9 shows an example of a command issued when the circle drawingoperation shown in FIG. 8 is set.

FIG. 10 shows a case wherein the circle drawing operation on the usercoordinate system shown in FIG. 8 is converted into a circle drawingoperation on the printer coordinate system having a coordinateunit=1/300 inch (about 1/11.8 mm).

As shown in FIG. 10, the effective print area height is set to be 400mm.

The x-coordinate of the center is 1,770 (150×11.8), the y-coordinate is2,950 (250×11.8), and the radius is 590 (50×11.8).

FIG. 11 shows an example of memory development information of the circledrawing operation shown in FIG. 10, which information is generated byanalyzing the circle drawing command shown in FIG. 9.

FIG. 12 shows an example of a line color designation command issued whenthe circle drawing operation shown in FIG. 8 is performed using yellow(a color corresponding to the coloring agent at a density of 100%).

Note that each of the Y-, M-, C-, and Bk-values falls within a range of0 to 255. In this case, the Y-value is 255, and other values are 0.

As described above, in control of a conventional image processingapparatus for performing a color print operation on the basis of the PDLor page description commands, development memories each having a sizecorresponding to the effective print area of a sheet are used for Y(yellow), M (magenta), C (cyan), and Bk (black) as coloring agents oftoners or inks.

However, the conventional apparatus suffers from the followingdrawbacks.

(1) When color print control is performed based on the PDL or pagedescription commands in, e.g., an ink-jet printer which can interruptrecording at a halfway position of a sheet, and can restart recording,Y, M, C, and Bk memories each having a size corresponding to theeffective print area of a sheet need not always be required, and thememory cannot be efficiently utilized.

(2) Since recording is started after all the page description elementsor page description commands for recording one page are analyzed, andfigures, characters, or the like are developed onto a memory, it takesmuch time for drawing.

(3) When color print control is performed based on the PDL or pagedescription commands in, e.g., an ink-jet printer which can move a printhead in the vertical and horizontal directions, control is not made tomove the head within only a drawing range, or to print only the contentof a memory which actually stores a drawing pattern of the Y, M, C, andBk memories in the drawing range, resulting in the long drawing time.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide an image processingmethod and apparatus, in which a horizontal range where data to be drawnis present is obtained and stored as a table in units of the height of arecord head, and the moving range of the record head is controlledaccording to the table, so that the record head is moved within only anecessary range, thereby shortening a time required for drawing.

It is another object of the present invention to provide an imageprocessing method and apparatus, which can specify an area for recordingrecord information, and can eliminate unnecessary development onto amemory since information that falls outside the specified area is notdeveloped to bit image data.

It is still another object of the present invention to provide an imageprocessing method and apparatus, in which when paper jam occurs duringrecording, a table formed before the paper jam is held, paper jamrecovery processing is performed, and the held table is utilized afterthe paper jam recovers, thereby shortening the processing time forre-forming the table.

It is still another object of the present invention to provide an imageprocessing method and apparatus, which need not have attributeinformation in units of pages since attribute information of drawinginformation is reflected up to the next page, thereby effectivelyutilizing a memory.

It is still another object of the present invention to provide an imageprocessing method and apparatus, which can perform efficient developmentin correspondence with a memory condition since the height of adevelopment area is changed according to a memory capacity that can beused upon development of bit image data.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a view showing an example of a user coordinate system;

FIG. 2 is a view showing an example of a printer coordinate system;

FIG. 3 shows an example of a memory map of an internal RAM area of acolor image processing apparatus which has Y, M, C, and Bk memories eachhaving a size corresponding to an effective print area of a sheet;

FIG. 4 is a view showing an example of a line color designation commandof drawing attribute commands;

FIG. 5 is a view showing an example of a circle drawing command ofdrawing commands;

FIG. 6 is a view showing an example of memory development information ofa line-color-designation function of drawing attribute functions;

FIG. 7 is a view showing an example of memory development information ofa circle drawing function of drawing functions;

FIG. 8 is a view showing an example of a circle drawing operation on theuser coordinate system;

FIG. 9 is a view showing an example of a circle drawing command issuedwhen the circle drawing operation shown in FIG. 8 is set;

FIG. 10 is a view showing an example of conversion of the circle drawingoperation shown in FIG. 8 onto the printer coordinate system;

FIG. 11 is a view showing an example of memory development informationof the circle drawing operation shown in FIGS. 8 and 10;

FIG. 12 is a view showing an example of a line color command designatedwhen an outline of the circle shown in FIG. 8 is drawn using yellow(coloring agent Yellow at 100%);

FIG. 13 is a block diagram showing a circuit arrangement of an imageprocessing apparatus according to an embodiment of the presentinvention;

FIG. 14 is a perspective view showing details of a portion around a headunit of an ink-jet image processing apparatus;

FIG. 15 is a view showing details of a heat unit 101 shown in FIG. 14;

FIG. 16 is a view showing an example of a band structure;

FIG. 17 is a view showing an example of a case wherein an effectiveprint area of a sheet is divided into eight bands;

FIG. 18 shows an example of a memory map of a RAM area in which adevelopment memory for one band is prepared for each coloring agent;

FIG. 19 shows an example of a memory map of a RAM area in which twodevelopment memories each for one band are prepared for each coloringagent;

FIG. 20 is a view showing an example of an attributes area for storingdrawing attribute information used upon data development onto a memory;

FIG. 21 is a view showing an example of a path control table;

FIG. 22 is a flow chart executed when a color print operation isperformed using only one-band memories corresponding to coloring agents;

FIG. 23 is a flow chart executed when the color print operation isperformed using only one-band memories corresponding to coloring agents;

FIG. 24 is a flow chart executed when the color print operation isperformed using only one-band memories corresponding to coloring agents;

FIG. 25 is a flow chart executed when the path control table isinitialized in step S1 in FIG. 22;

FIG. 26 is a view showing the content of the path control tableinitialized by the flow chart of FIG. 25;

FIGS. 27A to 27C are views showing examples of color designationcommands of drawing attribute designation commands;

FIGS. 28A to 28C are views showing examples of a line width designationcommand, a clip area designation command, and a paint definitiondesignation command;

FIG. 29 is a view showing an example of a line or polygon drawingcommand;

FIGS. 30A and 30B are views showing examples of a circle drawing commandand a character print command;

FIG. 31 is a view showing an example of a command analysis jump table;

FIG. 32 is a flow chart showing details of command data analysisprocessing;

FIG. 33 is a flow chart showing details of processing for executing acolor-designation-command-analysis function;

FIG. 34 is a flow chart showing the details of the processing forexecuting the color-designation-command-analysis function;

FIG. 35 is a flow chart showing the details of the processing forexecuting the color-designation-command-analysis function;

FIG. 36 is a flow chart showing details of processing for executing aline-width-designation-command-analysis function;

FIG. 37 is a flow chart showing details of processing for executing aclip-area-designation-command-analysis function;

FIG. 38 is a flow chart showing details of processing for executing apaint-definition-designation-command analysis function;

FIG. 39 is a flow chart showing details of processing for setting a minband No. and a max band No. in a memory development information area;

FIG. 40 is a diagram showing color reproduction processing;

FIG. 41 shows color conversion processing;

FIG. 42 shows the color conversion processing;

FIG. 43 is a flow chart showing processing upon execution of aline-drawing-command-analysis function;

FIG. 44 is a flow chart showing the processing upon execution of theline-drawing-command-analysis function;

FIG. 45 is a flow chart showing the processing upon execution of theline-drawing-command-analysis function;

FIG. 46 is a flow chart showing processing upon execution of apolygon-drawing-command-analysis function;

FIG. 47 is a flow chart showing the processing upon execution of thepolygon-drawing-command-analysis function;

FIG. 48 is a flow chart showing the processing upon execution of thepolygon-drawing-command-analysis function;

FIG. 49 is a flow chart showing processing for setting data in a workarea;

FIG. 50 is a flow chart showing the processing for setting data in thework area;

FIG. 51 is a flow chart showing the processing for setting data in thework area;

FIG. 52 is a flow chart showing processing upon execution of acircle-drawing-command-analysis function;

FIG. 53 is a flow chart showing the processing upon execution of thecircle-drawing-command-analysis function;

FIG. 54 is a flow chart showing the processing upon execution of thecircle-drawing-command-analysis function;

FIG. 55 is a flow chart showing the processing upon execution of thecircle-drawing-command-analysis function;

FIG. 56 is a flow chart showing processing upon execution of acharacter-drawing-command-analysis function;

FIG. 57 is a flow chart showing the processing upon execution of thecharacter-drawing-command-analysis function;

FIG. 58 is a flow chart showing the processing upon execution of thecharacter-drawing-command-analysis function;

FIG. 59 is a flow chart showing the processing upon execution of thecharacter-drawing-command-analysis function;

FIG. 60 is a flow chart showing processing for calculating a drawingrange;

FIG. 61 is a view showing a drawing range of a polygon;

FIG. 62 is a flow chart showing processing for calculating a circledrawing range;

FIG. 63 is a view showing a circle drawing range;

FIG. 64 is a flow chart showing processing for calculating a characterdrawing range;

FIG. 65 is a view showing a character drawing range;

FIG. 66 is a flow chart showing clip check processing for a drawingrange;

FIG. 67 is a flow chart showing the clip check processing for a drawingrange;

FIG. 68 is view showing a case wherein a clip area is set in a drawingrange;

FIG. 69 is a flow chart showing processing for setting color designationinformation (line);

FIG. 70 is a flow chart showing processing for setting color designationinformation (closed figure);

FIG. 71 is a flow chart showing processing in step S301 in FIG. 70;

FIG. 72 is a flow chart showing processing in step S302 in FIG. 70;

FIG. 73 is a flow chart showing processing for setting color designationinformation (character);

FIG. 74 is a flow chart showing processing for calculating a min bandNo. and a max band No.;

FIG. 75 is a flow chart showing processing for setting information in apath control table used in an output unit;

FIG. 76 is a flow chart showing the processing for setting informationin the path control table used in the output unit;

FIG. 77 is a flow chart showing the processing for setting informationin the path control table used in the output unit;

FIG. 78 is a flow chart showing the processing for setting informationin the path control table used in the output unit;

FIG. 79 is a view showing a case wherein a polygon and a character aredrawn on areas of paths 0, 1, and 2;

FIG. 80 is a view showing an example of the path control table;

FIG. 81 is a view showing an example of memory development informationof a color designation command;

FIGS. 82A to 82C are views showing examples of memory developmentinformation;

FIGS. 83A and 83B are views showing examples of memory developmentinformation;

FIGS. 84A and 84B are views showing examples of memory developmentinformation;

FIG. 85 is a view showing a case wherein a drawing operation isperformed using band memories in units of coloring agents, drawingattribute commands, and drawing commands;

FIGS. 86A to 86D are views showing examples of memory developmentinformation;

FIGS. 87A to 87E are views showing examples of memory developmentinformation;

FIG. 88 is a view showing a case wherein a drawing operation isperformed while setting a clip area designation mode for a line drawingoperation;

FIGS. 89A to 89D are views showing examples of memory developmentinformation;

FIG. 90 shows a command execution jump table 1;

FIG. 91 shows a command execution jump table 2;

FIG. 92 is a flow chart showing details of processing in step S12 ofFIG. 23;

FIG. 93 is a flow chart showing details of processing in step S390 ofFIG. 92;

FIG. 94 is a view showing an example of printer coordinates set when theband height is set to be 512 dots;

FIG. 95 is a view showing an example of a clip area setting operation;

FIG. 96 is a flow chart showing details of processing in step S391 ofFIG. 92;

FIG. 97 is a view showing top or head addresses of virtual memories inunits of coloring agents;

FIG. 98 is a flow chart showing processing upon execution of aline-width-designation function;

FIG. 99 is a flow chart showing processing upon execution of aline-color-designation function;

FIG. 100 is a flow chart showing processing upon execution of apaint-color-designation function;

FIG. 101 is a flow chart showing processing upon execution of acharacter-color-designation function;

FIG. 102 is a flow chart showing processing upon execution of aclip-area-designation function;

FIG. 103 is a flow chart showing processing upon execution of apaint-definition-designation function;

FIG. 104 is a flow chart showing processing upon execution of aline-drawing function;

FIG. 105 is a flow chart showing the processing upon execution of theline-drawing function;

FIG. 106 is a flow chart showing processing upon execution of apolygon-drawing function;

FIG. 107 is a flow chart showing the processing upon execution of thepolygon-drawing function;

FIG. 108 is a flow chart showing the processing upon execution of thepolygon-drawing function;

FIG. 109 is a flow chart showing processing upon execution of acircle-drawing function;

FIG. 110 is a flow chart showing the processing upon execution of thecircle-drawing function;

FIG. 111 is a flow chart showing processing upon execution of acharacter-drawing function;

FIG. 112 is a flow chart showing processing upon execution of thecharacter-drawing function;

FIG. 113 is a flow chart showing processing upon execution of a skipoperation;

FIG. 114 is a flow chart showing the processing upon execution of acolor print operation;

FIG. 115 is a flow chart showing the processing upon execution of thecolor print operation;

FIG. 116 is a view showing a band height information table storing bandheights and memory capacities;

FIG. 117 is a flow chart showing processing for changing and settingdevelopment memories in units of coloring agents on the basis of RAMcapacity information;

FIG. 118 is a flow chart showing another embodiment of FIG. 117;

FIG. 119 is a flow chart showing processing for initializing a bandmemory;

FIG. 120 is a flow chart showing the processing for initializing theband memory;

FIG. 121 is a flow chart showing the processing for initializing theband memory;

FIG. 122 is a flow chart showing processing which can be replaced withcolor print processing;

FIG. 123 is a flow chart showing processing which can be replaced withcolor print processing;

FIG. 124 is a flow chart showing processing which can be replaced withcolor print processing;

FIG. 125 is a flow chart showing processing which can be replaced withcolor print processing;

FIG. 126 is a flow chart showing processing for performing color printprocessing upon selection of a mode;

FIG. 127 is a view showing an example of an operator control panel 22shown in FIG. 13;

FIG. 128 shows an example of a memory map using a set of band memoriescorresponding to coloring agents;

FIG. 129 is a flow chart showing processing for performing color printprocessing upon selection of a mode;

FIG. 130 is a view showing an example of a print control command shownin FIG. 129; and

FIG. 131 is a flow chart showing selection processing of a print controlmode on the basis of a reserved capacity of a RAM area.

FIG. 132 is a flow chart showing jamming detection/recovery processing;

FIG. 133 is a flow chart showing details of jamming recovery processingin step S706; and

FIG. 134 is a flow chart showing details of jamming recovery processingin step S706.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The preferred embodiments of the present invention will be described indetail hereinafter with reference to the accompanying drawings.

FIG. 13 is a block diagram showing a circuit arrangement of an imageprocessing apparatus according to an embodiment of the presentinvention.

As shown in FIG. 13, an image processing apparatus according to thisembodiment is constituted by a host computer 1 and an image processingapparatus main body 2.

The host computer 1 supplies print data or print commands to the imageprocessing apparatus like in processing shown in the flow charts to bedescribed later, and causes the image processing apparatus to executeprint processing. The image processing apparatus has a microprocessorsystem including a CPU, a ROM, and a RAM. More specifically, the imageprocessing apparatus main body comprises an interface 2 for exchangingdata with the host computer 1, a command analyzer 3, which has a commandanalysis jump table 4 for storing jump addresses to analysis programscorresponding to command Nos. of commands sent from the host computer 1,and analyzes print data or commands sent from the host computer 1 togenerate information for one page, which can be developed onto adevelopment memory, a band storage 5, which has a band height table 6for storing a band height and information (memory capacity) of thedevelopment memory for one coloring agent corresponding to the bandheight, and stores information such as the band height, a color storage7 for storing information necessary for color reproduction processing, acolor reproduction unit 8 for performing the color reproductionprocessing, a character storage 9 for storing information for drawing acharacter, a controller 10 for controlling the apparatus, a memorydevelopment storage 11 having an attributes area 12 for storingattribute information, and a memory development information area 13 forstoring information for memory development, a memory developmentanalyzer 14, which has a command execution jump table 1 (15) and acommand execution jump table 2 (16), and analyzes memory developmentinformation, a pattern development unit 17 for developing the analyzedmemory development information onto a development memory 18, an outputunit 19, which has a path control table 20 for controlling, e.g.,movement of a print head, and an output buffer 21, and outputs developeddata onto a sheet as a permanently visualized image, an operator controlpanel 22 at which print environmental parameters can be changed and set,and a data bus 23.

FIG. 14 is a perspective view showing details of a portion around a headunit of an ink-jet image processing apparatus.

A head unit 101 is constituted by arranging a large number of ink-jetheads in the sub-scanning direction in correspondence with one coloringagent. In this embodiment, Y, M, C, and Bk head units are prepared.

Ink tanks 102 and signal lines 103 are connected to these head units. Acarriage drive motor 104 moves a carriage, which mounts the head unitsthereon, along a rail in cooperation with a conveyor belt.

FIG. 14 also illustrates print paper 107, a platen 108, print paperconvey rollers 109 and 110, a print paper roll 111, and a guide roller112.

Each head unit 101 is constituted by a plurality of ink-jet headsutilizing heat generation elements shown in FIG. 15. For example,ink-jet heads utilizing electro-mechanical conversion means such aspiezo elements may also be used.

FIG. 15 shows details of the head units 101 shown in FIG. 14.

In FIG. 15, each head unit has the number of Y, M, C, or Bk nozzlescorresponding to the head height.

More specifically, the head units 101 have yellow, magenta, cyan, andblack ink ejection nozzles.

FIG. 16 shows an example of a band structure.

As shown in FIG. 16, a rectangular area having a width corresponding tothe effective print area width of a sheet, and a length corresponding tothe head height is defined as a segment.

One band is defined by vertically arranging the segments, as shown inFIG. 16, and has a size corresponding to an integer multiple of thesegment.

Therefore, the band height corresponds to an integer multiple of thehead height.

In FIG. 16, one band is constituted by four segments.

FIG. 17 shows a case wherein the effective print area of a sheet isdivided into eight bands each having a band height corresponding to 512scan lines.

As shown in FIG. 17, the eight bands respectively have band Nos. 0 to 7.

When the number of bands is n, the band Nos. are assigned from 0 to(n-1).

A point (e.g., (0, 512)) on the printer coordinates shown in FIG. 17indicates a point at the upper left corner of each band area, and iscalculated by (0, (n-1)×512).

The effective print area height is not always equal to the integermultiple of the band height. The height of a final band (a band 7 inFIG. 17) is sometimes equal to or smaller than the band height.

FIG. 18 shows an example of a memory map of an internal RAM area of thecolor image processing apparatus.

The RAM area is constituted by a system work memory, a reserved area,and memories (i.e., memories each having a size corresponding to oneband area in FIG. 17) each having a size corresponding to one band for Y(yellow), M (magenta), C (cyan), and Bk (black) as coloring agents(toners or inks).

The system work memory is used as a storage area of information (e.g.,variables) used in control in the image processing apparatus, and apermanent work area.

The reserved area is used as an area for storing memory developmentinformation, a character cache memory, and the like.

A dotted portion represents the size of the RAM area shown in FIG. 3.

In this manner, since the development memories need only have a size 1/8that shown in FIG. 3, a color print operation can be performed using asmaller RAM area than a conventional apparatus.

FIG. 19 shows an example of a memory map when Y (yellow), M (magenta), C(cyan), and Bk (black) one-band memories are added to the RAM area shownin FIG. 18.

In this case, since the sizes of the development memories can be 1/4that shown in FIG. 4, a color print operation can be performed using asmaller RAM area than a conventional apparatus.

FIG. 20 shows the attributes area (RAM) 12 shown in FIG. 13.

The attributes area is constituted by areas for temporarily retreatingdrawing attribute information used upon data development onto a memory,and variable areas in which the drawing attribute information is set.

As shown in FIG. 20, a retreat area is determined for each drawingattribute, and m pieces of information can be retreated.

lwidth, lymck, and the like represent variables in which each drawingattribute information is set.

FIG. 21 shows an example of the path control table 20 shown in FIG. 13.

In this case, a "path" means an area which has a width corresponding tothe effective print area width, and a height corresponding to the headheight, in which a print head is actually moved in the horizontaldirection.

In FIG. 21, n of a path n corresponds to a value obtained by subtracting1 from the number of paths in the effective print area of a sheet.

The path control table stores information for controlling horizontalmovement of the print head, and information for confirming thepresence/absence of the contents of the development memories to beprinted.

In FIG. 21, minimum and maximum values are those of a drawing range ofeach path, and are values in a +x direction on the printer coordinates.

The minimum value corresponds to a horizontal idle moving amount (itsunit is determined by the resolution of the image processing apparatus)of the print head without printing the contents of the developmentmemories.

The maximum value indicates a maximum value when the print head is movedfrom the minimum value while recording the contents of the developmentmemories.

In FIG. 21, a drawing memory flag indicates whether or not patterns aredeveloped on Y, M, C, and Bk development memories corresponding to eachpath. The drawing memory flag consists of 4 bits, i.e., 1 bit for eachof Y, M, C, and Bk.

If a bit is ON, this indicates that a pattern is developed on thecorresponding development memory; otherwise, this indicates that nopattern is developed.

FIGS. 22, 23, and 24 are flow charts when a color print operation isperformed using only Y (yellow), n (magenta), C (cyan), and Bk (black)one-band memories in the color image processing apparatus for receivingpage description command data in units of pages, and performing printcontrol in units of pages.

In step S1, the path control table shown in FIG. 21 is initialized (setwith initial values), and the flow advances to step S2.

In step S2, the attributes area shown in FIG. 20 is assured on the RAM,and the flow advances to step S3.

In step S3, a set of command data (e.g., one drawing command, drawingattribute command, or the like) is read, and the flow advances to stepS4.

In step S4, the read command data is analyzed by the command analyzer 3,and the flow advances to step S5.

If it is determined in step S5 that another command data for acorresponding page remains, the flow returns to step S3; otherwise, theflow advances to step S6.

In step S6, drawing attribute information necessary for data developmentonto the memories at that time is temporarily retreated in the retreatareas of the attributes area 12 assured in step S2, and the flowadvances to step S10.

In step S10, 0 is set in a constant i, and the flow advances to stepS11.

In step S11, a pointer is set the head of the first memory developmentinformation (one set) stored in the memory development information area13, and the flow then advances to step S12.

In step S12, the memory development information read in step S11 isanalyzed by the memory development analyzer 14, and is developed ontothe development memories (Y, M, C, and Bk band memories) correspondingto band portions i. Thereafter, the flow advances to step S13.

If it is determined in step S13 that another memory developmentinformation remains, the flow advances to step S14. In step S14, apointer is set at the head of the next memory development information(one set), and the flow returns to step S12.

If it is determined in step S13 that no information remains, the flowadvances to step S15.

In step S15, the contents of the memories developed in step S12 arecolor-printed by the output unit 19, and the flow advances to step S16.

In step S16, i is incremented by one, and the flow advances to step S17.

In step S17, the Y, M, C, and Bk band memories are cleared, and the flowadvances to step S18.

In step S18, the number of bands is compared with i, and if acoincidence is found therebetween, the processing is ended.

If a non-coincidence is found, the flow advances to step S19. In stepS19, the drawing attributes temporarily retreated in the retreat areasof the attributes area 12 in step S6 are loaded, and are set in thevariable areas of attributes area 12. The flow then returns to step S11.

With the above-mentioned processing, page description command data inunits of pages are received, and a color print operation can beperformed using only the Y (yellow), M (magenta), C (cyan), and Bk(black) one-band memories.

FIG. 25 is a flow chart showing processing upon initialization of thepath control table in step S1 of FIG. 22.

In step S20, a pointer is set at the head of the path control tableshown in FIG. 21, and the flow advances to step S21.

In step S21, 0 is set in a constant m, and the flow advances to stepS22.

In step S22, a value larger than the effective print area width (itsunit is equal to that of the printer coordinates) is set in a constantk, and the flow advances to step S23.

In step S23, the value k is set in the minimum value of the pathindicated by the pointer, and the flow advances to step S24.

In step S24, 0 is set in the maximum value of the path indicated by thepointer, and the flow advances to step S25.

In step S25, the drawing memory flag indicated by the pointer is clearedto 0, and the flow advances to step S26.

In step S26, the values m and n are compared with each other. If m isequal to or larger than n, the processing is ended.

Otherwise, the flow advances to step S27, and the pointer is advanced byone. The flow then advances to step S28, and m is incremented by one.The flow then returns to step S23.

With the above-mentioned processing, the path control table can beinitialized.

FIG. 26 shows the content of the path control table initialized by theflow chart of FIG. 25.

FIGS. 27A, 27B, and 27C show examples of color designation commands(line color designation, paint color designation, and character colordesignation commands) of drawing attribute designation commands.

The line color designation command is used for designating a color of aline or an outline of a figure.

The paint color designation command is used for designating a color forpainting a portion inside a closed figure.

The character color designation command is used for designating acharacter color.

A command No. varies depending on color designation commands, and isused for identifying a command.

The content of a number-of-data parameter indicates the number of datainput after the number-of-data parameter.

The content of a kind flag parameter indicates a kind of colordesignation data.

FIG. 27A shows a case wherein the kind flag value is 0, and representsthat color designation data are R (red), G (green), and B (blue)luminance data values as three primary colors of light.

FIG. 27B shows a case wherein the kind flag value is 1, and representsthat color designation data are L*, a*, and b* data values of a uniformperceptual space defined by the CIE (Commission Internationale del'Eelairage) in 1976.

FIG. 27C shows a case wherein the kind flag value is 2, and representsthat color designation data are Y (yellow), M (magenta), C (cyan), andBk (black) density data values as primary colors of coloring agents(toners or inks).

FIGS. 28A, 28B, and 28C show examples of a line width designationcommand, a clip area designation command, and a paint definitiondesignation command of the drawing attribute designation commands.

A command No. varies depending on drawing attribute designationcommands, and is used for identifying a command.

The content of a number-of-data parameter indicates the number of datainput after the number-of-data parameter.

The line width designation command shown in FIG. 28A is used fordesignating a line width of a line or an outline of a figure.

The unit of a line width value corresponds to the coordinate unit of theuser coordinate system.

The clip area designation command shown in FIG. 28B is used fordesignating a drawing enable area of figures, characters, or the like.

In FIG. 28B, the unit of x and y minimum and maximum values correspondsto the coordinate unit of the user coordinate system.

The paint definition designation command shown in FIG. 28C is used fordesignating a paint pattern inside an outline of a closed figure, andthe presence/absence of the outline.

In FIG. 28C, a paint pattern No. is used for identifying a paintpattern. When the pattern No. is 0, this indicates the absence of apaint pattern (blank), and when the pattern No. is other than 0, thisindicates a paint pattern such as a hatched pattern.

An outline flag indicates the absence of an outline when it is 0; itindicates the presence of an outline when it is 1.

FIG. 29 shows an example of a line or polygon drawing command of drawingcommands.

A command No. varies depending on drawing functions, and is used foridentifying a command.

The content of a number-of-data parameter indicates the number of datainput after the number-of-data parameter.

The line drawing command is used for drawing a line.

The polygon drawing command is used for drawing a polygon.

Note that x- and y-coordinate values of coordinates 1 to n are those onthe user coordinate system.

FIGS. 30A and 30B show examples of a circle drawing command and acharacter drawing command of the drawing commands.

A command No. varies depending on drawing functions, and is used foridentifying a command.

The content of a number-of-data parameter indicates the number of datainput after the number-of-data parameter.

The circle drawing command shown in FIG. 30A is used for drawing acircle.

The x- and y-coordinates of the center are those on the user coordinatesystem.

An actual radius is calculated by multiplying a coordinate unit of theuser coordinate system with a "radius" value.

The character drawing command shown in FIG. 30B is used for drawing acharacter.

The x- and y-coordinates of the drawing position are those on the usercoordinate system indicating a start reference position of a characterdrawing operation.

Character data represents a character string (e.g., ABC) to be printed.

FIG. 31 shows the command analysis jump table (ROM) 4 (FIG. 13) forstoring jump addresses to functions for analyzing the drawing commandsand drawing attribute commands.

The jump addresses to the respective command analysis functions arestored in correspondence with command Nos. (0 to n).

FIG. 32 is a flow chart showing details of command data analysisprocessing in step S4 shown in FIG. 22.

In step S30, a command No. is obtained from command data (one set), andthe flow advances to step S31.

In step S31, a pointer is set at the head of the command analysis jumptable shown in FIG. 31, and the flow advances to step S32.

In step S32, the pointer is advanced by an amount corresponding to thecommand No., and the flow advances to step S33.

In step S33, a content (jump address) indicated by the pointer isobtained, and the flow advances to step S34.

In step S34, a function indicated by the jump address is executed, andthe processing is ended.

FIGS. 33 to 35 are flow charts showing details of processing uponexecution of a color-designation-command-analysis function in step S34in FIG. 32.

In step S40, a min band No. and a max band No. are set in the memorydevelopment information area 13, and the flow advances to step S41.

In step S41, a command No. is read from a command, and is set in thememory development information area 13 to advance the pointer.Thereafter, the flow advances to step S42.

In step S42, a number-of-data parameter is read out from the command,and (the number of data-1) is set in a constant n. Thereafter, the flowadvances to step S43.

In step S43, "4" is set as the number of data in the memory developmentinformation area 13 to advance the pointer. The flow then advances tostep S44.

In step S44, a kind parameter is read from the command, and is set in akind flag Csmflg. The flow then advances to step S45.

In step S45, color designation data corresponding in number to theconstant n are read, and the flow advances to step S46.

In step S46, the value of the kind flag Csmflg is compared with 0.

If it is determined in step S46 that the value of the kind flag Csmflgis equal to 0, it is determined that the color designation data read instep S45 are R, G, and B luminance data, and the flow advances to stepS49. In step S49, the R, G, and B luminance data are converted into Y,M, C, and Bk density data, and the flow then advances to step S53.

If it is determined in step S46 that the value of the kind flag Csmflgis not equal to 0, the flow advances to step S47.

In step S47, the value of the kind flag Csmflg is compared with 1.

If it is determined in step S46 that the value of the kind flag Csmflgis equal to 0, it is determined that the color designation data read instep S45 are L*, a*, and b* data of the uniform perceptual space definedby the CIE (Commission Internationale de l'Eelairage) in 1976. The flowthen advances to step S50, and the CIE L*, a*, and b* data are convertedinto CIE X, Y, and Z data (of an XYZ calorimetric system defined by theCIE in 1931). Thereafter, the flow advances to step S51.

In step S51, the CIE X, Y, and Z data are converted into R, G, and Bluminance data, and the flow advances to step S52.

In step S52, the R, G, and B luminance data are converted into Y, M, C,and Bk density data, and the flow then advances to step S53.

If it is determined in step S47 that the value of the kind flag Csmflgis not equal to 1, the flow advances to step S48.

In step S48, the value of the kind flag Csmflg is compared with 2.

If it is determined in step S48 that the value of the kind flag Csmflgis equal to 2, it is determined that the color designation data read instep S45 are Y, M, C, and Bk density data, and the flow advances to stepS53. In step S53, the Y, M, C, and Bk density data are set in internalvariables (Lymck, Fymck, and Tymck), and the flow advances to step S54.In step S54, the Y, M, C, and Bk density data are set in the memorydevelopment information area 13 to advance the pointer. Thus, theprocessing is ended.

If it is determined in step S48 that the value of the kind flag Csmflgis not equal to 2, the processing is ended.

In this manner, the color designation command is analyzed, and memorydevelopment information of the color designation command is generated.

FIG. 36 is a flow chart showing details of processing upon execution ofa line-width-designation-command-analysis function in step S34 in FIG.32.

In step S60, a min band No. and a max band No. are set in the memorydevelopment information area 13, and the flow advances to step S61.

In step S61, a command No. is read from a command, and is set in thememory development information area 13 to advance a pointer. The flowthen advances to step S62.

In step S62, a number-of-data parameter is read out from the command,and is set as the number of data in the memory development informationarea 13 to advance the pointer. The flow then advances to step S63.

In step S63, a line-width value parameter is read from the command, andthe flow advances to step S64.

In step S64, the read line-width value is converted into a pixel (dot)value with reference to the resolution of the image processingapparatus, and the flow advances to step S65.

In step S65, the converted line-width value is set in an internalvariable Lwidth, and the flow advances to step S66.

In step S66, the converted line-width value is set in the memorydevelopment information area 13 to advance the pointer. The processingis then ended.

In this manner, the line width designation command is analyzed, andmemory development information of the line width designation command isgenerated.

FIG. 37 is a flow chart showing details of processing upon execution ofa clip-area-designation-command-analysis function in step S34 in FIG.32.

In step S70, a min band No. and a max band No. are set in the memorydevelopment information area 13, and the flow advances to step S71.

In step S71, a command No. is read from a command, and is set in thememory development information area 13 to advance a pointer. The flowthen advances to step S72.

In step S72, a number-of-data parameter is read from the command, and isset as the number of data in the memory development information area 13to advance the pointer. The flow then advances to step S73.

In step S73, x and y minimum and maximum value parameters of a clip areaare read from the command, and the flow advances to step S74.

In step S74, the read x and y minimum and maximum values are convertedinto values xmin, ymin, xmax, and ymax on the printer coordinate systemon the basis of the resolution of the image processing apparatus, andthe flow advances to step S75.

In step S75, the values xmin, ymin, xmax, and ymax are respectively setin cxmin, cymin, cxmax, and cymax, and the flow advances to step S76.

In step S76, the values xmin, ymin, xmax, and ymax are set in the memorydevelopment information area 13 to advance the pointer. Thereafter, theprocessing is ended.

In this manner, the clip area designation command is analyzed, andmemory development information of the clip area designation command isgenerated.

FIG. 38 is a flow chart showing details of processing upon execution ofa paint-definition-designation-command-analysis function in step S34 inFIG. 32.

In step S80, a min band No. and a max band No. are set in the memorydevelopment information area 13, and the flow advances to step S81.

In step S81, a command No. is read from a command, and is set in thememory development information area 13 to advance a pointer. The flowthen advances to step S82.

In step S82, a number-of-data parameter is read from the command, and isset as the number of data in the memory development information area 13to advance the pointer. The flow then advances to step S83.

In step S83, a paint pattern No. is read from the command, and is set inthe memory development information area 13 to advance the pointer. Theflow then advances to step S84.

In step S84, an outline flag is read from the command, and is set in thememory development information area 13 to advance the pointer.Thereafter, the flow advances to step S85.

In step S85, the paint pattern No. in an internal variable Fpat, and theflow advances to step S86.

In step S86, the content of the outline flag is set in an internalvariable Fpermt, and the processing is ended.

In this manner, the paint definition designation command is analyzed,and designation memory development information of the paint definitiondesignation command is generated.

FIG. 39 is a flow chart showing details of processing for setting themin band No. and the max band No. in the memory development informationarea in steps S40, S60, S70, and S80 in FIGS. 33, 36, 37, and 38.

In step S90, 0 is set in the min band No., and the flow advances to stepS91.

In step S91, the min band No. is set in the memory developmentinformation area 13 to advance a pointer, and the flow advances to stepS92.

In step S92, information indicating the current number of bands isobtained from the band storage 5, and the flow advances to step S93.

In step S93, a value (the number of bands-1) is set in the max band No.,and the flow advances to step S94.

In step S94, the max band No. is set in the memory developmentinformation area 13 to advance the pointer, and the processing is ended.

In this manner, in the memory development information of each drawingattribute, 0 is set in the min band No., and the value (the number ofbands-1) is set in the max band No. so that the memory developmentinformation is analyzed in each band processing.

FIG. 40 shows an example of color reproduction processing shown in stepsS49 and S52 in FIG. 34.

In process 1, density conversion processing for LOG-converting R, G, andB values as luminance information into C, M, and Y as densityinformation is executed.

In process 2, undercolor or color removal processing for extracting a Bkvalue from the C, M, and Y value is executed.

In process 3, masking processing is executed to correct unnecessaryabsorption characteristics of C, M, and Y toners or inks, so as toattain appropriate color reproduction.

In process 4, γ-conversion processing is executed to adjust a contrastand brightness according to an image.

The above-mentioned processing operations are performed by the colorreproduction unit 8 using information in the color storage 7.

The above-mentioned R, G, and B data are assumed to have a predeterminedconversion method with the CIE X, Y, and Z data.

FIG. 41 shows an example of color conversion processing in step S50 inFIG. 34.

The CIE L*, a*, and b* data can be converted into the CIE X, Y, and Zdata by equations (a) to (d).

Note that Xn, Yn, and Zn are values determined according to one of CIEstandard light sources to be used.

FIG. 42 shows an example of color conversion processing in step S51 inFIG. 34.

The CIE X, Y, and Z data can be converted into R, G, and B luminancedata by a matrix conversion equation shown in FIG. 42.

The parameter values of the matrix are determined according to one ofCIE standard light sources to be used, and this embodiment exemplifiesvalues when the CIE standard light source D65 is used.

FIGS. 43 to 45 show processing upon execution of aline-drawing-command-analysis function in step S34 in FIG. 32.

In step S600, data are set in a work area, and xmin, ymin, xmax, andymax are set. Thereafter, the flow advances to step S601.

In step S601, a drawing range (a line and a polygon) is calculated, andthe flow advances to step S602.

In step S602, clip check processing for the drawing range is performed,and the flow advances to step S603.

In step S603, a drawing range flag set in the clip check processing ofthe drawing range is checked.

If it is determined in step S603 that the drawing range flag=ERROR, theprocessing is ended.

However, if it is determined in step S603 that the drawing rangeflag≠ERROR, the flow advances to step S604 to set color designationinformation (line). Thereafter, the flow advances to step S605.

In step S605, information for the path control table 20 used in theoutput unit 19 is set, and the flow advances to step S606.

In step S606, the min band No. and the max band No. are calculated, andthe flow advances to step S607.

In step S607, a pointer 1 is set in the memory development informationarea 13, and the flow advances to step S608.

In step S608, the min band No. and the max band No. are set in thememory development information area 13 to advance the pointer 1, and theflow then advances to step S609.

In step S609, a pointer 2 is set at the head of the work area, and theflow advances to step S610.

In step S610, a command No. is obtained from the work area, and is setin the memory development information area 13. Thereafter, the flowadvances to step S611.

In step S611, the pointers 1 and 2 are advanced, and the flow advancesto step S612.

In step S612, the number of data is obtained from the work area, and isset in the memory development information area 13. The flow thenadvances to step S613.

In step S613, 1 is set in m, and the flow advances to step S614.

In step S614, xm and ym are obtained from the work area, and are set inthe memory development information area 13. Thereafter, the flowadvances to step S615.

In step S615, m and n (the numbers of coordinates) are compared witheach other.

If m is equal to or larger than n, the processing is ended.

However, if n is larger than m, the flow advances to step S616 toincrement m by 1, and the flow advances to step S617.

In step S617, the pointers 1 and 2 are advanced, and the flow returns tostep S614.

In this manner, the line drawing command is analyzed, and memorydevelopment information of the line drawing command is generated.

FIGS. 46 to 48 show processing upon execution of apolygon-drawing-command-analysis function in step S34 in FIG. 32.

In step S120, data are set in a work area, and xmin, ymin, xmax, andymax are set. Thereafter, the flow advances to step S121.

In step S121, a drawing range (a line and a polygon) is calculated, andthe flow advances to step S122.

In step S122, clip check processing for the drawing range is performed,and the flow advances to step S123.

In step S123, a drawing range flag set in the clip check processing ofthe drawing range is checked.

If it is determined in step S123 that the drawing range flag=ERROR, theprocessing is ended.

However, if it is determined in step S123 that the drawing rangeflag≠ERROR, the flow advances to step S124 to set color designationinformation (closed figure). Thereafter, the flow advances to step S125.

In step S125, information for the path control table 20 used in theoutput unit 19 is set, and the flow advances to step S126.

In step S126, the min band No. and the max band No. are calculated, andthe flow advances to step S127.

In step S127, a pointer 1 is set in the memory development informationarea 13, and the flow advances to step S128.

In step S128, the min band No. and the max band No. are set in thememory development information area 13 to advance the pointer 1, and theflow then advances to step S129.

In step S129, a pointer 2 is set at the head of the work area, and theflow advances to step S130.

In step S130, a command No. is obtained from the work area, and is setin the memory development information area 13. Thereafter, the flowadvances to step S131.

In step S131, the pointers 1 and 2 are advanced, and the flow advancesto step S132.

In step S132, the number of data is obtained from the work area, and isset in the memory development information area 13. The flow thenadvances to step S133.

In step S133, 1 is set in m, and the flow advances to step S134.

In step S134, xm and ym are obtained from the work area, and are set inthe memory development information area 13. Thereafter, the flowadvances to step S135.

In step S135, m and n (the numbers of coordinates) are compared witheach other.

If n is larger than m, the flow advances to step S136 to increment m by1, and the flow advances to step S137.

In step S137, the pointers 1 and 2 are advanced, and the flow returns tostep S134.

If it is determined in step S135 that m is equal to or larger than n,the flow advances to step S138.

In step S138, the pointer 2 is set at the head of the work area, and theflow advances to step S139.

In step S139, the pointer 2 is advanced by 2, and is set in x1. The flowthen advances to step S140.

In step S140, x1 and y1 are obtained from the work area, and are set inthe memory development information area 13, thus ending the processing.

In this manner, the polygon drawing command is analyzed, and memorydevelopment information of the polygon drawing command is generated.

FIGS. 49 to 50 show details of processing for setting data in the workarea, and setting xmin, ymin, xmax, and ymax in step S600 in FIG. 43 andS120 in FIG. 46.

In step S150, a pointer is set at the head of the work area, and theflow advances to step S151.

In step S151, a command No. is read, and is set in the work area toadvance the pointer, and thereafter, the flow advances to step S152.

In step S152, the number of data is read, and is set in the work area toadvance the pointer. Thereafter, the flow advances to step S153.

In step S153, a value 1/2 the number of data (the number of coordinatepoints of a line) is set in a constant n, and the flow advances to stepS154.

In step S154, x- and y-coordinates of coordinates 1 are read, and theflow advances to step S155.

In step S155, the x- and y-coordinates of the coordinates 1 areconverted into printer coordinates, and are set in x1 and y1. The flowthen advances to step S156.

In step S156, x1 is set in xmin and xmax, and y1 is set in ymin andymax. The flow then advances to step S157.

In step S157, x1 and y1 are set in the work area to advance the pointer.Thereafter, the flow advances to step S158.

In step S158, 1 is set in m, and the flow advances to step S159.

In step S159, m and n (the numbers of coordinates) are compared witheach other.

If m is equal to or larger than n, the processing is ended.

However, if n is larger than m, the flow advances to step S160 toincrement m by 1, and the flow advances to step S161.

In step S161, x- and y-coordinates of coordinates m are read, and theflow advances to step S162.

In step S162, the x- and y-coordinates of the coordinates m areconverted into printer coordinates, and are set in xm and ym.Thereafter, the flow advances to step S163.

In step S163, values xm and xmin are compared with each other.

If xm is equal to or larger than xmin, the flow advances to step S165.

If xmin is larger than xm, the flow advances to step S164 to set thevalue xm in xmin, and the flow advances to step S165.

In step S165, values xm and xmax are compared with each other.

If xmax is equal to or larger than xm, the flow advances to step S167.

If xm is larger than xmax, the flow advances to step S166 to set thevalue xm in xmax, and the flow advances to step S167.

In step S167, values ym and ymin are compared with each other.

If ym is equal to or larger than ymin, the flow advances to step S169.

If ymin is larger than ym, the flow advances to step S168 to set thevalue ym in ymin, and the flow advances to step S169.

In step S169, values ym and ymax are compared with each other.

If ymax is equal to or larger than ym, the flow advances to step S171.

If ym is larger than ymax, the flow advances to step S170 to set thevalue ym in ymax, and the flow advances to step S171.

In step S171, xm and ym are set in the work area to advance the pointer.Thereafter, the flow returns to step S159.

In this manner, data can be set in the work area, and xmin, ymin, xmax,and ymax can be set.

FIGS. 52 to 55 show processing upon execution of acircle-drawing-command-analysis function in step S34 in FIG. 32.

In step S175, a pointer is set at the head of the work area, and theflow advances to step S176.

In step S176, a command No. is read, and is set in the work area toadvance the pointer. Thereafter, the flow advances to step S177.

In step S177, the number of data is read, and is set in the work area toadvance the pointer, and the flow then advances to step S178.

In step S178, x- and y-coordinates of the center are read, and the flowadvances to step S179.

In step S179, the x- and y-coordinates of the center are converted intoprinter coordinates, and are set in xc and yc. Thereafter, the flowadvances to step S180.

In step S180, xc and yc are set in the work area to advance the pointer,and the flow then advances to step S181.

In step S181, a radius value is read from the command, and the flowadvances to step S182.

In step S182, the radius value is converted into a pixel (dot) value onthe basis of the resolution of the image processing apparatus, and isset in r. Thereafter, the flow advances to step S183.

In step S183, r is set in the work area, and the flow advances to stepS184.

In step S184, the drawing range of a circle is calculated, and the flowadvances to step S185.

In step S185, clip check processing of the drawing range is executed,and the flow then advances to step S186.

In step S186, a drawing range flag set in the clip check processing ofthe drawing range is checked.

If it is determined in step S186 that the drawing range flag=ERROR, theprocessing is ended.

However, if it is determined in step S186 that the drawing rangeflag≠ERROR, the flow advances to step S187 to set color designationinformation (closed figure), and the flow then advances to step S188.

In step S188, information for the path control table 20 used in theoutput unit 19 is set, and the flow advances to step S189.

In step S189, the min band No. and the max band No. are calculated, andthe flow advances to step S190.

In step S190, a pointer 1 is set in the memory development informationarea 13, and the flow advances to step S191.

In step S191, the min band No. and the max band No. are set in thememory development information area 13 to advance the pointer 1, and theflow then advances to step S192.

In step S192, a pointer 2 is set at the head of the work area, and theflow then advances to step S193.

In step S193, the command No. is obtained from the work area, and is setin the memory development information area 13. Thereafter, the flowadvances to step S194.

In step S194, the pointers 1 and 2 are advanced, and the flow advancesto step S195.

In step S195, the number of data is obtained from the work area, and isset in the memory development information area 13. The flow thenadvances to step S196.

In step S196, the pointers 1 and 2 are advanced, and the flow advancesto step S197.

In step S197, xc and yc are obtained from the work area, and are set inthe memory development information area 13. Thereafter, the flowadvances to step Sl98.

In step S198, the pointers 1 and 2 are advanced, and the flow advancesto step S199.

In step S199, r is obtained from the work area, and is set in the memorydevelopment information area 13, thus ending the processing.

In this manner, the circle drawing command is analyzed, and memorydevelopment information of the circle drawing command is generated.

FIGS. 56 to 59 show processing upon execution of acharacter-drawing-command-analysis function in step S34 in FIG. 32.

In step S210, a pointer is set at the head of the work area, and theflow advances to step S211.

In step S211, a command No. is read, and is set in the work area toadvance the pointer. The flow then advances to step S212.

In step S212, the number of data is read, and the flow advances to stepS213.

In step S213, x- and y-coordinates of a drawing position are read, andthe flow advances to step S214.

In step S214, the x- and y-coordinates of the drawing position areconverted into printer coordinates, and are set in xr and yr.Thereafter, the flow advances to step S215.

In step S215, character data is read from the command, and is convertedinto an internal code. The flow then advances to step S216.

In step S216, (the number of data in the internal code)+2 is set as thenumber of data in the work area to advance the pointer, and the flowadvances to step S217.

In step S217, xr and yr are set in the work area to advance the pointer,and the flow advances to step S218.

In step S218, the internal code is set in the work area, and the flowadvances to step S219.

In step S219, the drawing range of a character is calculated, and theflow advances to step S220.

In step S220, clip check processing of the drawing range is executed,and the flow then advances to step S221.

In step S221, a drawing range flag set in the clip check processing ofthe drawing range is checked.

If it is determined in step S221 that the drawing range flag=ERROR, theprocessing is ended.

However, if it is determined in step S221 that the drawing rangeflag≠ERROR, the flow advances to step S222 to set color designationinformation (character), and the flow then advances to step S223.

In step S223, information for the path control table 20 used in theoutput unit 19 is set, and the flow advances to step S224.

In step S224, the min band No. and the max band No. are calculated, andthe flow advances to step S225.

In step S225, a pointer 1 is set in the memory development informationarea 13, and the flow advances to step S226.

In step S226, the min band No. and the max band No. are set in thememory development information area 13 to advance the pointer 1, and theflow then advances to step S227.

In step S227, a pointer 2 is set at the head of the work area, and theflow then advances to step S228.

In step S228, the command No. is obtained from the work area, and is setin the memory development information area 13. Thereafter, the flowadvances to step S229.

In step S229, the pointers 1 and 2 are advanced, and the flow advancesto step S230.

In step S230, the number of data is obtained from the work area, and isset in the memory development information area 13. The flow thenadvances to step S231.

In step S231, the pointers I and 2 are advanced, and the flow advancesto step S232.

In step S232, xr and yr are obtained from the work area, and are set inthe memory development information area 13. The flow then advances tostep S233.

In step S233, the pointers 1 and 2 are advanced, and the flow advancesto step S234.

In step S234, the internal code is obtained from the work area, and isset in the memory development information area 13, thus ending theprocessing.

In this manner, the character drawing command is analyzed, and memorydevelopment information of the character drawing command is generated.

FIG. 60 shows details of the processing for calculating the drawingrange in step S601 in FIG. 43 and in step S121 in FIG. 46.

In step S240, xmin and xmax are respectively set in pxmin and pxmax, andthe flow advances to step S241.

In step S241, ymin and ymax are respectively set in pymin and pymax, andthe flow advances to step S242.

In step S242, α (a constant equal to or larger than 0) is added toLwidth/2, and the sum is set in β. The flow then advances to step S243.

In step S243, pxmin-β is set in pxmin, and pxmax +β is set in pxmax. Theflow then advances to step S244.

In step S244, pymin-β is set in pymin, and pymax +β is set in pymax,thus ending the processing.

In this manner, the drawing range for a line and a polygon can becalculated.

FIG. 61 shows a drawing range for a polygon designated by four points(x1, y1) to (x4, y4).

This range is a rectangular area surrounded by (pxmin, pymin) and(pxmax, pymax), and corresponds to a calculation result when the value αis set to be 0 in the processing shown in FIG. 60.

FIG. 62 shows details of the processing for calculating the drawingrange for a circle in step S184 in FIG. 53.

In step S250, xc-r is set in pxmin, and xc+r is set in pxmax. The flowadvances to step S251.

In step S251, yc-r is set in pymin, and yc+r is set in pymax. The flowadvances to step S252.

In step S252, α (a constant equal to or larger than 0) is added toLwidth/2, and the sum is set in β. The flow then advances to step S253.

In step S253, pxmin-β is set in pxmin, and pxmax +β is set in pxmax. Theflow then advances to step S254.

In step S254, pymin-β is set in pymin, and pymax +β is set in pymax,thus ending the processing.

In this manner, the drawing range for a circle can be calculated.

FIG. 63 shows the drawing range for a circle.

This range is a rectangular area surrounded by (pxmin, pymin) and(pxmax, pymax), and corresponds to a calculation result when the value αis set to be 0 in the processing shown in FIG. 62.

FIG. 64 shows details of the processing for calculating the drawingrange for a character in step S219 in FIG. 57.

In step S260, left and top offset values are obtained from the characterstorage 9 (FIG. 13), and the flow advances to step S261.

In step S261, the left and top offset values are respectively set in α1and α2, and the flow advances to step S262.

In step S262, xr+α1 is set in pxmin, and yr-α2 is set in pymin. The flowthen advances to step S263.

In step S263, a pattern width and pattern height are obtained from thecharacter storage 9, and the flow advances to step S264.

In step S264, the pattern width is set in β1, and the pattern height isset in β2. The flow then advances to step S265.

In step S265, pxmin+β1 is set in pxmax, and pymin+β2 is set in pymax.Thus, the processing is ended.

In this manner, the drawing range for a character can be calculated.

FIG. 65 shows the drawing range for a character.

This range is a rectangular area surrounded by (pxmin, pymin) and(pxmax, pymax).

FIGS. 66 and 67 show details of the clip check processing for thedrawing range in step S602 in FIG. 43, step S122 in FIG. 46, step S185in FIG. 53, and step S220 in FIG. 57.

In step S270, values pxmax and cxmin are compared with each other.

If cxmin is larger than the value pxmax, the flow advances to step S274,and the drawing range flag is set to be ERROR, thus ending processing.

Otherwise, the flow advances to step S271.

In step S271, values pxmin and cxmax are compared with each other.

If pxmin is larger than the value cxmax, the flow advances to step S274,and the drawing range flag is set to be ERROR, thus ending processing.

Otherwise, the flow advances to step S272.

In step S272, values pymax and cymin are compared with each other.

If cymin is larger than the value pymax, the flow advances to step S274,and the drawing range flag is set to be ERROR, thus ending processing.

Otherwise, the flow advances to step S273.

In step S273, values pymin and cymax are compared with each other.

If pymin is larger than the value cymax, the flow advances to step S274,and the drawing range flag is set to be ERROR, thus ending processing.

Otherwise, the flow advances to step S275.

In step S275, values pxmin and cxmin are compared with each other.

If cxmin is larger than the value pxmin, the flow advances to step S276,and the value cxmin is set in pxmin. The flow then advances to stepS277.

Otherwise, the flow advances to step S277.

In step S277, values pymin and cymin are compared with each other.

If cymin is larger than the value pymin, the flow advances to step S278,and the value cymin is set in pymin. Thereafter, the flow advances tostep S279.

If pymin≧cymin in step S277, the flow advances to step S279.

In step S279, values pxmax and cymax are compared with each other.

If pxmax is larger than the value cxmax, the flow advances to step S280,and the value cxmax is set in pxmax. The flow then advances to stepS281.

If pxmax≦cxmax in step S279, the flow advances to step S281.

In step S281, values pymax and cymax are compared with each other.

If pymax is larger than the value cymax, the flow advances to step S282,and the value cymax is set in pymax. The flow then advances to stepS283.

If pymax≦cymax in step S281, the flow advances to step S283.

In step S283, the drawing range flag is set to be OK, and the processingis ended.

In this manner, a common range between the drawing range and the cliparea can be obtained.

FIG. 68 shows a case wherein a clip area defined by a rectangular areasurrounded by (cxmin, cymin) and (cxmax, cymax) is set for the drawingrange defined by a rectangular area surrounded by (pxmin, pymin) and(pxmax, pymax).

With the processing shown in FIGS. 66 and 67, the drawing range shown inFIG. 68 is defined by a rectangular area surrounded by (cxmin, cymin)and (cxmax, cymax).

FIG. 69 shows details of the processing for setting color designationinformation (line) in step S604 in FIG. 43.

In step S290, a Y-value of Lymck is set in P₋₋ Y, and the flow advancesto step S291.

In step S291, an M-value of Lymck is set in P₋₋ M, and the flow advancesto step S292.

In step S292, a C-value of Lymck is set in P₋₋ C, and the flow advancesto step S293.

In step S293, a Bk-value of Lymck is set in P₋₋ Bk, and the processingis ended.

In this manner, color designation information of a line can be set inP₋₋ Y, P₋₋ M, P₋₋ C, and P₋₋ Bk.

FIG. 70 shows details of processing for setting color designationinformation (closed figure) in step S124 in FIG. 46 and step S187 inFIG. 53.

In step S300, a product of values Fpat and Fpermt is compared with 0.

If the product is equal to 0, the flow advances to step S301, and colordesignation information is set (subprocessing 1), thus ending theprocessing.

If the product is not equal to 0, the flow advances to step S302, andcolor designation information is set (subprocessing 2), thus ending theprocessing.

FIG. 71 shows details of the processing in step S301 in FIG. 70.

In step S310, the value Fpat is compared with 0.

If the value Fpat is not equal to 0, the flow advances to step S311, anda Y-value of Fymck is set in P₋₋ Y. The flow then advances to step S312.

In step S312, an M-value of Fymck is set in P₋₋ M, and the flow advancesto step S313.

In step S313, a C-value of Fymck is set in P₋₋ C, and the flow advancesto step S314.

In step S314, a Bk-value of Fymck is set in P₋₋ Bk, and the processingis ended.

If it is determined in step S310 that the value Fpat is equal to 0, theflow advances to step S315, and the value Fpermt is compared with 0.

If the value Fpermt is equal to 0, the processing is ended.

If the value FpernMt is not equal to 0, a Y-value of Lyrck is set in P₋₋Y, and the flow advances to step S317.

In step S317, an M-value of Lymck is set in P₋₋ M, and the flow advancesto step S318.

In step S318, a C-value of Lyrnck is set in P₋₋ C, and the flow advancesto step S319.

In step S319, a Bk-value of Lyt ck is set in P₋₋ Bk, and the processingis ended.

In this manner, color designation information for a closed figure can beset in P₋₋ Y, P₋₋ M, P₋₋ C, and P₋₋ Bk.

FIG. 72 shows details of the processing in step S302 in FIG. 70.

In step S320, a Y-value of Fymck is compared with a Y-value of Lymck.

If the Y-value of Fyrck is larger than the Y-value of Lymck, the flowadvances to step S321, and the Y-value of Fymck is set in P₋₋ Y. Theflow then advances to step S323.

Otherwise, the flow advances to step S322, the Y-value of Lymck is setin P₋₋ Y, and the flow advances to step S323.

In step S323, an M-value of Fymck is compared with an M-value of Lymck.

If the M-value of Fymck is larger than the M-value of Lymck, the flowadvances to step S324, and the M-value of Fyick is set in P₋₋ M. Theflow then advances to step S326.

Otherwise, the flow advances to step S325, the M-value of Lymck is setin P₋₋ M, and the flow advances to step S326.

In step S326, a C-value of Fymck is compared with a C-value of Lymck.

If the C-value of Fymck is larger than the C-value of Lymck, the flowadvances to step S327, and the C-value of Fymck is set in P₋₋ C. Theflow then advances to step S329.

Otherwise, the flow advances to step S328, the C-value of Lymck is setin P₋₋ C, and the flow advances to step S329.

In step S329, a Bk-value of Fymck is compared with a Bk-value of Lymck.

If the Bk-value of Fymck is larger than the Bk-value of Lymck, the flowadvances to step S330, and the Bk-value of Fymck is set in P₋₋ Bk, thusending the processing.

Otherwise, the flow advances to step S331, the Bk-value of Lymck is setin P₋₋ Bk, thus ending the processing.

In this manner, color designation information for a closed figure can beset in P₋₋ Y, P₋₋ M, P₋₋ C, and P₋₋ Bk.

FIG. 73 shows details of the processing for setting color designationinformation (character) in step S222 in FIG. 57.

In step S340, a Y-value of Tymck is set in P₋₋ Y, and the flow advancesto step S341.

In step S341, an M-value of Tymck is set in P₋₋ M, and the flow advancesto step S342.

In step S342, a C-value of Tymck is set in P₋₋ C, and the flow advancesto step S343.

In step S343, a Bk-value of Tymck is set in P₋₋ Bk, thus ending theprocessing.

In this manner, color designation information for a character can be setin P₋₋ Y, P₋₋ M, P₋₋ C, and P₋₋ Bk.

FIG. 74 shows details of the processing for calculating the min band No.and the max band No. in step S606 in FIG. 44, step S126 in FIG. 47, stepS189 in FIG. 54, and step S224 in FIG. 58.

In step S350, information indicating a band height (the height of oneband) is obtained from the band storage 5, and the flow advances to stepS351.

In step S351, the band height is set in h, and the flow advances to stepS352.

In step S352, pymin and pymax of the drawing range information areobtained, and the flow advances to step S353.

In step S353, a quotient of (pymin/h) is set in the min band No., andthe flow then advances to step S354.

In step S354, a quotient of (pymax/h) is set in the max band No., thusending the processing.

In this manner, the min band No. and max band No. can be calculated fromthe drawing range information.

FIGS. 75 to 78 show details of the processing for setting informationfor the path control table used in the output unit in step S605 in FIG.43, step S125 in FIG. 46, step S188 in FIG. 53, and step S223 in FIG.57.

In step S360, information indicating a head height (the height of theprint head) is obtained from the band storage 5, and the flow advancesto step S361.

In step S361, the head height is set in h, and the flow advances to stepS362.

In step S362, pxmin, pxmax, pymin, and pymax of the drawing rangeinformation are obtained, and the flow advances to step S363.

In step S363, a quotient of (pymin/h) is set in a min path No., and theflow advances to step S364.

In step S364, a quotient of (pymax/h) is set in a max path No., and theflow advances to step S365.

In step S365, P₋₋ Y, P₋₋ M, P₋₋ C, and P₋₋ Bk as the pieces of colordesignation information are obtained, and the flow advances to stepS366.

In step S366, a pointer is set at the head of the path control table,and the flow advances to step S367.

In step S367, the pointer is advanced by the min path No., and the flowadvances to step S368.

In step S368, the value of the min path No. is set in α, and the flowadvances to step S369.

In step S369, a value pxmin is compared with a minimum value indicatedby the pointer.

If the minimum value is larger than the value pxmin, the flow advancesto step S370, and the value pxmin is set in the minimum value.Thereafter, the flow advances to step S371.

If pxmin≧minimum value, the flow advances to step S371.

In step S371, a value pxmax is compared with a maximum value indicatedby the pointer.

If the value pxmax is larger than the maximum value, the flow advancesto step S372, and the value pxmax is set in the maximum value.Thereafter, the flow advances to step S373.

If pxmax≦maximum value, the flow advances to step S373.

In step S373, the value P₋₋ Y is compared with 0.

If the value P₋₋ Y is not equal to 0, the flow advances to step S374,and a Y bit of a drawing information flag is set ON. Thereafter, theflow advances to step S375.

If the value P₋₋ Y is equal to 0, the flow advances to step S375.

In step S375, a value P₋₋ M is compared with 0.

If the value P₋₋ M is not equal to 0, the flow advances to step S376,and an M bit of the drawing information flag is set ON. Thereafter, theflow advances to step S377.

If the value P₋₋ M is equal to 0, the flow advances to step S377.

In step S377, a value P₋₋ C is compared with 0.

If the value P₋₋ C is not equal to 0, the flow advances to step S378,and a C bit of the drawing information flag is set ON. Thereafter, theflow advances to step S379.

If the value P₋₋ C is equal to 0, the flow advances to step S379.

In step S379, a value P₋₋ Bk is compared with 0.

If the value P₋₋ Bk is not equal to 0, the flow advances to step S380,and a Bk bit of the drawing information flag is set ON. Thereafter, theflow advances to step S381.

If the value P₋₋ Bk is equal to 0, the flow advances to step S381.

In step S381, the value of the max path No. is compared with the valueα.

If the value of the max path No. is larger than α, the flow advances tostep S382 to increment α by 1, and the flow advances to step S383.

In step S383, the pointer is advanced by one, and the flow returns tostep S369.

If it is determined in step S381 that the max path No. is equal to orsmaller than α, the processing is ended.

In this manner, information for the path control table used in theoutput unit can be set.

FIG. 79 shows a case wherein a polygon and a character are drawn onareas of paths 0, 1, and 2.

x1 and x2 respectively indicate the minimum and maximum values ofx-coordinates of a polygon drawing area.

x3 and x4 respectively indicate the minimum and maximum values ofx-coordinates of a character drawing area.

FIG. 80 shows the path control table when information for the pathcontrol table used in the processing shown in FIGS. 75 to 78 by theoutput unit is set for the drawing example shown in FIG. 79.

In FIG. 80, a value k is set in the initialization of the path controltable shown in FIG. 25.

FIG. 81 shows an example of memory development information of colordesignation commands (line, paint, character) generated by analyzing thecolor designation command shown in FIG. 27 on the basis of the flowcharts shown in FIGS. 33 to 35.

In FIG. 81, a command table No. varies depending on memory developmentinformation of color designation commands, and is used for identifying acommand.

In this case, the content of the number-of-data parameter is 4.

Y-, M-, C-, and Bk-values are density data values of Y (yellow), M(magenta), C (cyan), and Bk (black) as primary colors of coloring agents(toners or inks), and represent that color designation data values areconverted into Y, M, C, and Bk data values upon generation of memorydevelopment information after analysis even when a color designationcommand includes another kind of color designation data values.

FIGS. 82A, 82B, and 82C respectively show examples of memory developmentinformation generated by analyzing the line width designation command(FIG. 28A), the clip area designation command (FIG. 28B), and the paintdefinition designation command (FIG. 28C) according to the flow chartsshown in FIGS. 36, 37, and 38.

In FIGS. 82A to 82C, a command table No. varies depending on memorydevelopment information, and is used for identifying a command.

The content of a number-of-data parameter indicates the number of datainput after the number-of-data parameter.

FIGS. 83A and 83B respectively show examples of memory developmentinformation generated by analyzing the line and polygon drawing commandsshown in FIG. 29 on the basis of the flow charts shown in FIGS. 43 to45, and in FIGS. 46 to 48.

In FIGS. 83A and 83B, a command table No. varies depending on memorydevelopment information, and is used for identifying a command.

The content of a number-of-data parameter indicates the number of datainput after the number-of-data parameter.

The final parameters of the memory development information of thepolygon drawing command are x1 and y1, as shown in FIG. 83B, since theycorrespond to the start point (i.e., the polygon is closed at the startpoint).

FIGS. 84A and 84B respectively show examples of memory developmentinformation generated by analyzing the circle drawing command (FIG. 30A)and the character drawing command (FIG. 30B) on the basis of the flowcharts shown in FIGS. 52 to 55 and in FIGS. 56 to 59.

In FIGS. 84A and 84B, a command table No. varies depending on memorydevelopment information, and is used for identifying a command.

The content of a number-of-data parameter indicates the number of datainput after the number-of-data parameter.

FIG. 85 shows a case wherein one page is divided into four bands, and adrawing operation is performed using Y, M, C, and Bk band memories eachhaving this band size, and some of the drawing attribute commands anddrawing commands shown in FIGS. 27A to 30B.

A drawing order is an order of a circle, polygon, and character.

The circle is designated to have an internal paint mode=OFF, an outlinemode=ON, and an outline color of cyan.

The polygon is designated to have an internal paint mode=ON, an outlinemode=OFF, and a paint color of magenta.

The character has an internal paint color of yellow.

FIGS. 86A to 86D and FIGS. 87A to 87E show memory developmentinformation used in the drawing operation shown in FIG. 85.

In FIGS. 86A to 86D and FIGS. 87A to 87E, pieces of information arealigned in the analysis order, i.e., in the reception order of commands.

As shown in FIGS. 86A to 86D and FIGS. 87A to 87E, in all the pieces ofmemory development information of the drawing attribute commands, themin band No. is set to be 0, and the max band No. is set to be 3, sothat the corresponding commands are analyzed in all the bands.

If the pieces of memory development information of the drawing attributecommands are not set as described above, since drawing attributeinformation must be added to memory development information of acorresponding drawing command, the data amount of the memory developmentinformation is undesirably increased.

As for memory development information of each drawing command, a minimumband No. where a drawing range is present is set in the min band No.,and a maximum band No. where the drawing range is present is set in themax band No.

For example, in the memory development information of the circle drawingcommand, the min band No. is 1, and the max band No. is 2.

FIG. 88 shows a case wherein one page is divided into four bands, Y, M,C, and Bk band memories each having this band size are used, a clip areadesignation mode is set in the line drawing command, and a drawingoperation is performed.

The color of a line is assumed to be red (M100%, Y100%).

FIGS. 89A to 89D show memory development information used in the drawingoperation shown in FIG. 88.

In FIGS. 89A to 89D, pieces of information are aligned in the analysisorder, i.e., in the reception order of commands.

The drawing range of a line extends from a band "0" to a band "3" by theprocessing shown in FIG. 60 regardless of a clip area.

In consideration of the clip area, the drawing range of the line extendsfrom a band "1" to a band "2" by the processing shown in FIGS. 66 and67.

Therefore, as for the memory development information of the line drawingcommand, the min band No. is set to be 1, and the max band No. is set tobe 2.

FIG. 90 shows the command execution jump table 1 (ROM), which storesjump addresses to functions for developing patterns to be drawn onto amemory in practice, and jump addresses to functions for designatingdrawing attributes (setting attributes in internal variables, and thelike).

The jump addresses are stored in correspondence with command Nos. (0 ton).

FIG. 91 shows the command execution jump table 2 (ROM) in which all thejump addresses to the functions for developing patterns to be drawn ontothe memory in FIG. 90 are replaced with jump addresses to skipfunctions.

Like in FIG. 90, the jump addresses are stored in correspondence withcommand Nos. (0 to n).

FIG. 92 is a flow chart showing details of the processing in step S12 inFIG. 23.

In step S390, a possible drawing range is set in consideration of a cliprange (a rectangular area for setting a possible drawing range of afigure, character, and the like), and the flow advances to step S391.

In step S391, the head addresses of Y, M, C, and Bk virtual pagememories are calculated and set, and the flow advances to step S392.

In step S392, min and max band No. values of memory developmentinformation are read, and a pointer is advanced to indicate the nextdata. The flow then advances to step S393.

In step S393, a command No. is read, and the flow advances to step S394.

In step S394, it is checked if a relation of min band No.≦i (currentband No.)≦max band No. is established.

If YES in step S394, the flow advances to step S395, and a pointer isset at the head of the command execution jump table 1 shown in FIG. 90.The flow then advances to step S397.

If NO in step S394, the flow advances to step S396, and a pointer is setat the head of the command execution jump table 2 shown in FIG. 91. Theflow then advances to step S397.

In step S397, the table pointer is advanced by an address correspondingto the command No., and the flow advances to step S398.

In step S398, a content (jump address) indicated by the pointer isobtained, and the flow advances to step S399.

In step S399, a function indicated by the jump address is executed, andthe processing is ended.

FIG. 93 is a flow chart showing details of the processing in step S390in FIG. 92.

In the following description, y-coordinate values of the drawing range,and clip area values are assumed to be those on the printer coordinatesystem.

In step S400, band height information the height of one band (the numberof dots or the number of scan lines)! is obtained from the band storage5, and the flow advances to step S401.

In step S401, a value given by (the above-mentioned band height)×i(current band No.) is set in a minimum value many of the y-coordinate ofthe possible drawing range, and the flow advances to step S402.

In step S402, a value (i+1) is compared with the number of bands.

If the number of bands is larger than the value (i+1), the flow advancesto step S403, a value given by (the above-mentioned band height)×(i+1)-1is set in a maximum value maxy of the y-coordinate of the possibledrawing range. Thereafter, the flow advances to step S405.

Otherwise, the flow advances to step S404, a maximum value of they-coordinate of the effective print area of a sheet is set in themaximum value maxy of the y-coordinate of the possible drawing range.Thereafter, the flow advances to step S405.

In step S405, a minimum value dspymi and a maximum value dspymx of they-coordinate of information of the clip area (a rectangular area forsetting a possible drawing range of a figure, character, and the like)are obtained, and the flow advances to step S406.

In step S406, miny and dspymi are compared with each other.

If miny is larger than dspymi, the flow advances to step S407, and thevalue miny is set in dspymi. Thereafter, the flow advances to step S408.

If miny≦dspymi, the flow directly advances to step S408.

In step S408, maxy and dspymx are compared with each other.

If dspymx is larger than maxy, the flow advances to step S409, and thevalue maxy is set in dspymx, thus ending the processing.

If maxy≦dspymx, the processing is directly ended.

An actual possible drawing range for a figure, character, and the like,used in band memory development uses dspymi and dspymx set in this flow.

FIG. 94 shows the printer coordinates set when a band height=512 dots.

In this case, as shown in FIG. 94, the value miny of a band "0" is 0,and the value maxy is 511. The value miny of a band "1" is 512, and thevalue maxy is 1023.

FIG. 95 shows a case wherein a clip area satisfying dspymi<miny andmaxy<dspymx is set for a possible drawing range for a figure, character,and the like when a band No.=i.

In this case, an actual possible drawing range for a figure, character,and the like used in band memory development having a band No.corresponding to i is a hatched portion in FIG. 95 according to theprocessing described above.

Note that dspxmi and dspxmx are minimum and maximum values of thex-coordinate of the clip area.

FIG. 96 is a flow chart showing details of processing in step S391 inFIG. 92.

In step S410, information X₋₋ bandptr (X=y, m, c, k) of the head addressof each of Y, M, C, and Bk band memories is obtained from the bandstorage 5, and the flow advances to step S411.

In step S411, information indicating the capacity (byte) of each bandmemory is obtained from the band storage 5, and the flow advances tostep S412.

In step S412, the head addresses of Y, M, C, and Bk virtual pagememories are calculated by X₋₋ topadr (X=y, m, c, k)×i (current bandNo.), thus ending processing.

FIG. 97 shows the head addresses of the Y, M, C, and Bk virtual pagememories when a pattern is to be developed on a fifth band (band No. 4)shown in FIG. 17.

The addresses shown in FIG. 97 are obtained by the processing shown inFIG. 96.

FIG. 98 shows processing upon execution of a line-width-designationfunction in step S399 in FIG. 92.

In step S420, a line width value is read from memory developmentinformation of the line width designation command, and the flow advancesto step S421.

In step S421, the line width value is set in a variable lwidth as linewidth information used when a drawing pattern is developed onto a memoryupon execution of a drawing function, thus ending the processing.

FIG. 99 shows processing upon execution of a line-color-designationfunction in step S399 in FIG. 92.

In step S430, Y-, M-, C-, and Bk-values of a line color are read frommemory development information of a line color designation command, andthe flow advances to step S431.

In step S431, the Y-, M-, C-, and Bk-values are set in a variable lymckas line color information used when a drawing pattern is developed ontoa memory upon execution of a drawing function, thus ending theprocessing.

FIG. 100 shows processing upon execution of a paint-color-designationfunction in step S399 in FIG. 92.

In step S430, Y-, M-, C-, and Bk-values of a paint color are read frommemory development information of a paint color designation command, andthe flow advances to step S431.

In step S431, the Y-, M-, C-, and Bk-values are set in a variable fymckas paint color information used when a drawing pattern is developed ontoa memory upon execution of a drawing function, thus ending theprocessing.

FIG. 101 shows processing upon execution of acharacter-color-designation function in step S399 in FIG. 92.

In step S440, Y-, M-, C-, and Bk-values of a character color are readfrom memory development information of a character color designationcommand, and the flow advances to step S441.

In step S441, the Y-, M-, C-, and Bk-values are set in a variable tymckas character color information used when a drawing pattern is developedonto a memory upon execution of a drawing function, thus ending theprocessing.

FIG. 102 shows processing upon execution of a clip-area-designationfunction in step S399 in FIG. 92.

In step S450, values xmin, ymin, xmax, and ymax of a clip area are readfrom memory development information of a clip area designation command,and the flow advances to step S451.

In step S451, the values xmin, ymin, xmax, and ymax are respectively setin variables dspxmi, dspymi, dspxmx, and dspymx as clip area informationused when a drawing pattern is developed onto a memory upon execution ofa drawing function. The flow then advances to step S452.

In step S452, values miny and maxy (on the printer coordinates) of adrawing range of a band corresponding to a band No. i are obtained fromthe band storage 5, and the flow advances to step S453.

In step S453, miny and dspymi are compared with each other.

If miny is larger than dspymi, the flow advances to step S454 to set thevalue miny in dspymi. The flow then advances to step S455.

If miny≦dspymi, the flow advances to step S455.

In step S455, maxy and dspymx are compared with each other.

If dspymx is larger than maxy, the flow advances to step S456 to set thevalue maxy in dspymx, thus ending the processing.

If dspymx≦maxy, the processing is directly ended.

FIG. 103 shows processing upon execution of apaint-definition-designation function in step S399 in FIG. 92.

In step S460, a paint pattern No. is read from memory developmentinformation of a paint definition designation command, and the flowadvances to step S461.

In step S461, the paint pattern No. is set in a variable fpat as paintpattern information used when a drawing pattern is developed onto amemory upon execution of a drawing function. The flow then advances tostep S462.

In step S462, an outline flag value is read from the memory developmentinformation of the paint definition designation command, and the flowadvances to step S463.

In step S463, the outline flag value is set in a variable fpermt asinformation indicating the presence/absence of an outline used when adrawing pattern is developed onto a memory upon execution of a drawingfunction, thus ending processing.

FIGS. 104 and 105 show processing upon execution of a line-drawingfunction in step S399 in FIG. 92.

In step S470, the number of data is read from memory developmentinformation of a line drawing command, and the flow advances to stepS471.

In step S471, a value (the number of coordinate points of a line) 1/2the number of data is set in a constant n, and the flow advances to stepS472.

In step S472, values of line color information lymck are obtained, andthe flow advances to step S473.

In step S473, clip area information values dspxmi, dspxmx, dspymi, anddspymx are obtained, and the flow advances to step S474.

In step S474, the head addresses of the Y, M, C, and Bk virtual pagememories are obtained, and the flow advances to step S475.

In step S475, 1 is set in a constant m, and the flow advances to stepS476.

In step S476, a point (xm, ym) on the printer coordinates is read fromthe memory development information of the line drawing command, and theflow advances to step S477.

In step S477, another point (xm+1, ym+1) on the printer coordinates isread from the memory development information of the line drawingcommand, and the flow advances to step S478.

In step S478, a line pattern between the two points (xm, ym) and (xm+1,ym+1) on the printer coordinates is developed onto the Y, M, C, and Bkband memories together with the line color information lymck, clip areainformation, and the head addresses of the Y, M, C, and Bk virtual pagememories. Thereafter, the flow advances to step S479.

In step S479, values n and (m+1) are compared with each other.

If n is larger than (m+1), the flow advances to step S480 to increment mby one. The flow then returns to step S477.

Otherwise, the processing is ended.

In this manner, a line drawing pattern can be developed onto the bandmemories using the memory development information of the line drawing,line color designation, and line width designation commands.

FIGS. 106 to 108 show processing upon execution of a polygon-drawingfunction in step S399 in FIG. 92.

In step S481, the number of data is read from memory developmentinformation of a polygon drawing command, and the flow advances to stepS482.

In step S482, a value (the number of coordinate points of a polygon) 1/2the number of data is set in a constant n, and the flow advances to stepS483.

In step S483, 1 is set in a constant m, and the flow advances to stepS484.

In step S484, a point (xm, ym) on the printer coordinates is read fromthe memory development information of the polygon drawing command, andthe flow advances to step S485.

In step S485, the values xm and ym are set in a storage area in thesystem work memory, and the flow advances to step S486.

In step S486, the values n and m are compared with each other.

If n is larger than m, the flow advances to step S487 to increment m byone, and the flow returns to step S484.

If n≦m, the flow advances to step S488.

In step S488, values dspxmi, dspxmx, dspymi, and dspymx of clip areainformation are obtained, and the flow advances to step S489.

In step S489, the head addresses of the Y, M, C, and Bk virtual pagememories are obtained, and the flow advances to step S490.

In step S490, the value of paint pattern information fpat is comparedwith 0.

If the value of the information fpat is equal to 0, flow advances tostep S493.

If the value of the information fpat is not equal to 0, the flowadvances to step S491 to obtain values of paint color information fymck,and the flow advances to step S492.

In step S492, an internal paint pattern of a polygon is developed ontoan area surrounded by outline points (x1, y1), . . . , (xm, ym) of thepolygon set in the storage area of the system work memory in step S485on the Y, M, C, and Bk band memories on the basis of the paint patterninformation fpat, the paint color information fymck, the clip areainformation, and the head addresses of the Y, M, C, and Bk virtual pagememories. Thereafter, the flow advances to step S493.

In step S493, a value of outline information fpermt is compared with 0.

If the value of the information fpermt is equal to 0, the processing isended.

If the value of the information fpermt is not equal to 0, the flowadvances to step S494, and 1 is set in the constant m. The flow thenadvances to step S495.

In step S495, values of line color information lymck are obtained, andthe flow advances to step S496.

In step S496, coordinates xm and ym of an outline point of a polygon areobtained from the storage area in the system work memory, and the flowadvances to step S497.

In step S497, coordinates xm+1 and ym+1 of another outline point of thepolygon are obtained from the storage area in the system work memory,and the flow advances to step S498.

In step S498, a line pattern between the two points (xm, ym) and (xm+1,ym+1) on the printer coordinates is developed onto the Y, M, C, and Bkband memories on the basis of the line color information lymck, the cliparea information, and the head addresses of the Y, M, C, and Bk virtualpage memories. Thereafter, the flow advances to step S499.

In step S499, values n and (m+1) are compared with each other.

If n is larger than (m+1), the flow advances to step S500 to increment mby one, and the flow then returns to step S497.

Otherwise, the processing is ended.

In this manner, a polygon drawing pattern can be developed onto the bandmemories on the basis of the memory development information of thepolygon drawing, paint definition designation, line color designation,and paint color designation commands.

FIGS. 109 and 110 show processing upon execution of a circle-drawingfunction in step S399 in FIG. 92.

In step S501, the number of data is read from memory developmentinformation of a circle drawing command, and the flow advances to stepS502.

In step S502, xc and yc as the x- and y-coordinates of the center areread from the memory development information of the circle drawingcommand, and the flow advances to step S503.

In step S503, a radius r is read from the memory development informationof the circle drawing command, and the flow advances to step S504.

In step S504, values dspxmi, dspxmx, dspymi, and dspymx of clip areainformation are obtained, and the flow advances to step S505.

In step S505, the head addresses of the Y, M, C, and Bk virtual pagememories are obtained, and the flow advances to step S506.

In step S506, a value of paint pattern information fpat is compared with0.

If the value of the information fpat is equal to 0, the flow advances tostep S509.

If the value of the information fpat is not equal to 0 the flow advancesto step S507 to obtain values of paint color information fymck. The flowthen advances to step S508.

In step S508, an internal paint pattern of a circle is developed ontothe Y, M, C, and Bk band memories on the basis of xc and yc, the radiusr, the paint pattern information fpat, the paint color informationfymck, the clip area information, and the head addresses of the Y, M, C,and Bk virtual page memories. The flow then advances to step S509.

In step S509, a value of outline information fpermt is compared with 0.

If the value of the information fpermt is equal to 0, the processing isended.

If the value of the information fpermt is not equal to 0, the flowadvances to step S510 to obtain values of color information lymck, andthe flow then advances to step S511.

In step S511, an outline pattern of a circle is developed onto the Y, M,C, and Bk band memories on the basis of xc and yc, the radius r, thepaint color information lymck, the clip area information, and the headaddresses of the Y, M, C, and Bk virtual page memories. Thereafter, theprocessing is ended.

In this manner, a circle drawing pattern can be developed onto the bandmemories on the basis of the memory development information of thecircle drawing, paint definition designation, line color designation,and paint color designation commands.

FIGS. 111 and 112 show processing upon execution of a character-drawingfunction in step S399 in FIG. 92.

In step S520, the number of data is read from memory developmentinformation of a character drawing command, and the flow advances tostep S521.

In step S521, the x- and y-coordinates xr and yr of the drawing positionare read from the memory development information of the characterdrawing command, and the flow advances to step S522.

In step S522, the internal code of a character is read from the memorydevelopment information of the character drawing command, and the flowadvances to step S523.

In step S523, values dspxmi, dspxmx, dspymi, and dspymx of clip areainformation are obtained, and the flow advances to step S524.

In step S524, the head addresses of the Y, M, C, and Bk virtual pagememories are obtained, and the flow advances to step S525.

In step S525, values of character color information tymck are obtained,and the flow advances to step S526.

In step S526, a character pattern is developed onto the Y, M, C, and Bkband memories on the basis of xr and yr, the internal code, thecharacter color information tymck, the clip area information, and thehead addresses of the Y, M, C, and Bk virtual page memories, thus endingthe processing.

In this manner, a character pattern can be developed onto the bandmemories on the basis of the memory development information of thecharacter drawing and character color designation commands.

FIG. 112 shows processing upon execution of a skip function in step S399in FIG. 92.

In step S530, the number of data is read from memory developmentinformation, and the flow advances to step S531.

In step S531, the number of data is set in a constant n, and the flowadvances to step S532.

In step S532, 0 is set in a constant j, and the flow advances to stepS533.

In step S533, a pointer is set at data next to the number-of-dataparameter, and the flow advances to step S534.

In step S534, data indicated by the pointer is read, and the flowadvances to step S535.

In step S535, the constant j is incremented by one, and the flowadvances to step S536.

In step S536, the pointer is advanced to indicate the next data, and theflow advances to step S537.

In step S537, the constant j and the number n of data are compared witheach other. If these values are not equal to each other, the flowreturns to step S534.

If these values are equal to each other, the processing is ended.

In this manner, the control can skip memory development information of adrawing command.

FIGS. 113 to 115 show processing upon execution of a color printoperation in step S15 in FIG. 23.

In step S540, the number of segments (the number of paths) per band isobtained from the band storage 5, and the flow advances to step S541.

In step S541, the number of segments per band is set in a constant α,and the flow advances to step S542.

In step S542, a pointer is set at the head of the path control table,and the flow advances to step S543.

In step S543, 1 is set in a constant β, and the flow advances to stepS544.

In step S544, a value of a drawing memory flag indicated by the pointeris compared with 0.

If the value of the flag is equal to 0, the flow advances to step S556.

If the value of the flag is not equal to 0, the flow advances to stepS545.

In step S545, it is checked if the Bk-bit of the drawing memory flag isON.

If the Bk-bit is not ON, the flow advances to step S547.

If a Bk-bit is ON, the flow advances to step S546, and the memorycontent of the current segment from the minimum value to the maximumvalue indicated by the pointer of the Bk band memory is stored in anoutput buffer. Thereafter, the flow advances to step S547.

In step S547, it is checked if a C-bit of the drawing memory flag is ON.

If the C-bit is not ON, the flow advances to step S549.

If the C-bit is ON, the flow advances to step S548, and the memorycontent of the current segment from the minimum value to the maximumvalue indicated by the pointer of the C band memory is stored in theoutput buffer. Thereafter, the flow advances to step S549.

In step S549, it is checked if an M-bit of the drawing memory flag isON.

If the M-bit is not ON, the flow advances to step S551.

If the M-bit is ON, the flow advances to step S550, and the memorycontent of the current segment from the minimum value to the maximumvalue indicated by the pointer of the M band memory is stored in theoutput buffer. Thereafter, the flow advances to step S551.

In step S551, it is checked if a Y-bit of the drawing memory flag is ON.

If the Y-bit is not ON, the flow advances to step S553.

If the Y-bit is ON, the flow advances to step S552, and the memorycontent of the current segment from the minimum value to the maximumvalue indicated by the pointer of the Y band memory is stored in theoutput buffer. Thereafter, the flow advances to step S553.

In step S553, the print head is horizontally moved to the position ofthe minimum value indicated by the pointer, and the flow advances tostep S554.

In step S554, the content of the output buffer is recorded on a sheet incorrespondence with the horizontal movement of the print head to theposition of the maximum value indicated by the pointer. Thereafter, theflow advances to step S555.

In step S555, the print head is horizontally moved to the left edge, andthe flow advances to step S556.

In step S556, the print head is vertically moved by the height of onesegment (path), and the flow advances to step S557.

In step S557, the values α and β are compared with each other.

If the two values are equal to each other, the processing is ended.

If the two values are not equal to each other, the flow advances to stepS558 to advance the pointer by one, and the flow then advances to stepS559.

In step S559, the value β is incremented by one, and the processing isended.

FIG. 116 shows a band height information table storing band heights andcorresponding development memory information (memory capacity) for onecoloring agent.

FIG. 117 is a flow chart showing an operation for changing band heightinformation on the basis of capacity information of an additional RAM,and changing and setting the Y, M, C, and Bk development memories.

In step S101, information of the memory capacity of an additional RAM isobtained, and is set in a constant a. The flow then advances to stepS102.

In step S102, a reference value (a memory capacity serving as areference for changing a band height) of the memory capacity is set inb, and the flow advances to step S103.

In step S103, the value a is divided (rounded) by the value b, and thequotient is set in a constant i. The flow then advances to step S104.

In step S104, a pointer is set at the head of the band heightinformation table shown in FIG. 116, and the flow advances to step S105.

In step S105, the pointer is advanced by the value i, and the flowadvances to step S106.

In step S106, band height information is obtained from the contentindicated by the pointer, and the flow advances to step S107.

In step S107, the obtained band height information is set in the currentband height information, and the flow advances to step S108.

In step S108, development memory information is obtained from thecontent indicated by the pointer, and the flow advances to step S109.

In step S109, the four, i.e., Y, M, C, and Bk development memories areassured and set on the RAM on the basis of the obtained developmentmemory information, thus ending the processing.

As described above, the height of one band can be changed according tothe capacity of an additional memory, and the development memory for oneband can be changed.

The processing shown in FIG. 117 can also be realized by processingshown in FIG. 118.

In step S201, information of the memory capacity of an additional RAM isobtained, and is set in a constant a. The flow then advances to stepS202.

In step S202, a constant b as a reference value (a memory capacityserving as a reference for changing a band height) of a predeterminedmemory capacity is compared with the constant a.

If b is larger than a, the processing is ended.

Therefore, neither the band height nor the development memory arechanged.

If a is equal to or larger than b, the flow advances to step S203.

In step S203, a constant c as a reference value (a memory capacityserving as a reference for changing a band height; c>b) of apredetermined memory capacity is compared with the constant a.

If c is larger than a, the flow advances to step S204. In step S204, aconstant d (a predetermined band height information value for thereference value b of the memory capacity) is set in the current bandheight information, and the flow advances to step S205.

In step S205, the four, i.e., Y, M, C, and Bk development memoriescorresponding to the band height information d are assured and set onthe RAM, thus ending the processing.

If it is determined in step S203 that a is equal to or larger than c,the flow advances to step S206.

In step S206, a constant e (a predetermined band height informationvalue for the reference value c of the memory capacity) is set in thecurrent band height information, and the flow advances to step S207.

In step S207, the four, i.e., Y, M, C, and Bk development memoriescorresponding to the band height information e are assured and set onthe RAM, thus ending the processing.

As described above, the height of one band can be changed according tothe capacity of an additional memory, and the development memory for oneband can be changed.

FIGS. 119 to 121 show band memory initialization processing that can bereplaced with the processing in step S17 shown in FIG. 23.

In step S560, the number of segments (the number of paths) per band isobtained from the band storage 5, and the flow advances to step S561.

In step S561, the number of segments per band is set in a constant α,and the flow advances to step S562.

In step S562, a pointer is set at the head of the path control table,and the flow advances to step S563.

In step S563, 1 is set in a constant β, and the flow advances to stepS564.

In step S564, 0 is set in flg (4 bits), and the flow advances to stepS565.

In step S565, a drawing memory flag indicated by the pointer and thecontent of flg are logically ORed, and the ORed result is set in flg.The flow then advances to step S566.

In step S566, the values α and β are compared with each other.

If the two values are not equal to each other, the flow advances to stepS567 to advance the pointer by one. Thereafter, the flow advances tostep S568.

In step S568, the value β is incremented by one, and the flow returns tostep S565.

If it is determined in step S566 that the two values are equal to eachother, the flow advances to step S569.

In step S569, it is checked if a Bk-bit (0th bit) of flg is equal to 0.

If the two values are equal to each other, the flow advances to stepS571.

If the two values are not equal to each other, the flow advances to stepS570, and the content of the Bk band memory is cleared. Thereafter, theflow advances to step S571.

In step S571, it is checked if a C-bit (1st bit) of flg is equal to 0.

If the two values are equal to each other, the flow advances to stepS573.

If the two values are not equal to each other, the flow advances to stepS572, and the content of the C band memory is cleared. Thereafter, theflow advances to step S573.

In step S573, it is checked if an M-bit (2nd bit) of fig is equal to 0.

If the two values are equal to each other, the flow advances to stepS575.

If the two values are not equal to each other, the flow advances to stepS574, and the content of the M band memory is cleared. Thereafter, theflow advances to step S575.

In step S575, it is checked if a Y-bit (3rd bit) of fig is equal to 0.

If the two values are equal to each other, the processing is ended.

If the two values are not equal to each other, the flow advances to stepS576, and the content of the Y band memory is cleared. Thereafter, theprocessing is ended.

FIGS. 122 to 125 show processing that can be replaced with the colorprint processing shown in FIGS. 113 to 115.

In step S620, the number of segments (the number of paths) per band isobtained from the band storage 5, and the flow advances to step S621.

In step S621, the number of segments per band is set in a constant α,and the flow advances to step S622.

In step S622, a pointer is set at the head of the path control table,and the flow advances to step S623.

In step S623, 1 is set in a constant β, and the flow advances to stepS624.

In step S624, the value of a drawing memory flag indicated by thepointer is compared with 0.

If the value of the flag is equal to 0, the flow advances to step S641.

If the value of the flag is not equal to 0, the flow advances to stepS625.

In step S625, it is checked if a Bk-bit of the drawing memory flag isON.

If the Bk-bit is not ON, the flow advances to step S627.

If the Bk-bit is ON, the flow advances to step S626, and the memorycontent of the current segment from the minimum value to the maximumvalue indicated by the pointer of the Bk band memory is stored in theoutput buffer. Thereafter, the flow advances to step S627.

In step S627, it is checked if a C-bit of the drawing memory flag is ON.

If the C-bit is not ON, the flow advances to step S629.

If the C-bit is ON, the flow advances to step S628, and the memorycontent of the current segment from the minimum value to the maximumvalue indicated by the pointer of the C band memory is stored in theoutput buffer. Thereafter, the flow advances to step S629.

In step S629, it is checked if an M-bit of the drawing memory flag isON.

If the M-bit is not ON, the flow advances to step S631.

If the M-bit is ON, the flow advances to step S630, and the memorycontent of the current segment from the minimum value to the maximumvalue indicated by the pointer of the M band memory is stored in theoutput buffer. Thereafter, the flow advances to step S631.

In step S631, it is checked if a Y-bit of the drawing memory flag is ON.

If the Y-bit is not ON, the flow advances to step S633.

If the Y-bit is ON, the flow advances to step S632, and the memorycontent of the current segment from the minimum value to the maximumvalue indicated by the pointer of the Y band memory is stored in theoutput buffer. Thereafter, the flow advances to step S633.

In step S633, the minimum and maximum values indicated by the pointerare respectively set in xmin and xmax, and the flow then advances tostep S634.

In step S634, the pointer is advanced to indicate a segment immediatelybelow the current segment, and the flow advances to step S635.

In step S635, the minimum value indicated by the pointer is comparedwith the value xmax.

If the minimum value is larger than xmax, the flow advances to step S636to horizontally move the print head to the position of xmin. Thereafter,the flow advances to step S637.

In step S637, the content of the output buffer is recorded on a sheet incorrespondence with the horizontal movement of the print head to theposition of xmax. Thereafter, the flow advances to step S641.

If it is determined in step S635 that the minimum value is equal to orsmaller than the value xmax, the flow advances to step S638 tohorizontally move the print head to the position of xmin. Thereafter,the flow advances to step S639.

In step S639, the content of the output buffer is recorded on a sheet incorrespondence with the horizontal movement of the print head to theposition of xmax. Thereafter, the flow advances to step S640 tohorizontally move the print head to the left edge, and the flow thenadvances to step S641.

In step S641, the print head is vertically moved by the height of onesegment (path), and the flow advances to step S642.

In step S642, the values α and β are compared with each other.

If the two values are equal to each other, the processing is ended.

If the two values are not equal to each other, the flow advances to stepS643 to increment the value β by one. Thereafter, the flow returns tostep S624.

The image processing apparatus of this embodiment can select one of amode for performing a color print operation using a set of Y, M, C, andBk band memories, and a mode for performing a color print operationusing two sets of Y, M, C, and Bk band memories according to aninstruction from the host computer 1 (FIG. 13) or the operator controlpanel 22 (FIG. 13), and can perform color print processing in theselected mode.

FIG. 126 is a flow chart showing processing for selecting one of theabove-mentioned mode according to an instruction from the operatorcontrol panel 22 (FIG. 13), and performing color print processing.

In step S650, a record control mode of the operator control panel 22(FIG. 13) is selected, and the flow advances to step S651.

In step S651, the selected record control mode is checked.

If the control mode using two sets of Y, M, C, and Bk band memories isselected, the flow advances to step S652 to select a record control mode(2-set mode) using two sets of Y, M, C, and Bk band memories. The flowadvances to step S653 to perform color print processing using the twosets of Y, M, C, and Bk band memories, thus ending the processing.

If the control mode using one set of Y, M, C, and Bk band memories isselected, the flow advances to step S654 to select a record control mode(1-set mode) using one set of Y, M, C, and Bk band memories. The flowthen advances to step S655 to perform color print processing using oneset of Y, M, C, and Bk band memories, thus ending the processing.

As described above, one of the color print mode using one set of Y, M,C, and Bk band memories, and the color print mode using two sets of Y,M, C, and Bk band memories can be selected on the operator controlpanel, and the color print processing can be performed in the selectedmode.

FIG. 127 shows the operator control panel 22 shown in FIG. 13.

As shown in FIG. 127, the operator control panel is constituted by anLCD display and switches. A switch at the right end in FIG. 127 is usedfor selecting the above-mentioned record control mode.

FIG. 128 shows an example of the memory map of a RAM area used uponexecution of record control using one set of Y, M, C, and Bk bandmemories.

As can be understood from comparison with FIG. 19 showing the example ofthe memory map of the RAM area used execution of record control usingtwo sets of Y, M, C, and Bk band memories, a reserved area that can beused for a character cache memory, and the like is large.

FIG. 129 is a flow chart showing processing for selecting a recordcontrol mode upon analysis of a record control command, and performingcolor print processing.

In step S660, a record control command is read, and the flow advances tostep S661.

In step S661, the read control command is analyzed by the commandanalyzer 3, and the flow advances to step S662.

In step S662, the selected record control mode is checked.

If the control mode using two sets of Y, M, C, and Bk band memories isselected, the flow advances to step S663 to select a record control mode(2-set mode) using the two sets of Y, M, C, and Bk band memories.Thereafter, the flow advances to step S664 to perform color printprocessing using the two sets of Y, M, C, and Bk band memories, thusending the processing.

If the control mode using one set of Y, M, C, and Bk band memories isselected, the flow advances to step S665 to select a record control mode(1-set mode) using one set of Y, M, C, and Bk band memories. Thereafter,the flow advances to step S666 to perform color print processing usingone set of Y, M, C, and Bk band memories, thus ending the processing.

As described above, one of the color print mode using one set of Y, M,C, and Bk band memories, and the color print mode using two sets of Y,M, C, and Bk band memories can be selected by analyzing the recordcontrol command, and the color print processing can be performed in theselected mode.

FIG. 130 shows an example of the record control command shown in FIG.129.

As shown in FIG. 130, the record control command consists of a commandNo. for identifying a command, and a record control mode selectionparameter.

When the value of the record control mode selection parameter is 0, itindicates the mode for performing color print control using one set ofY, M, C, and Bk band memories; when it is 1, it indicates the mode forperforming color print control using two sets of Y, M, C, and Bk bandmemories.

FIG. 131 is a flow chart showing processing for selecting the recordcontrol mode on the basis of a vacant capacity of the RAM area, andperforming color print processing.

In step S670, the vacant capacity of the RAM area is compared with aconstant M1 (a given capacity).

If the vacant capacity of the RAM area is equal to or larger than theconstant M1, the flow advances to step S671 to select a record controlmode (2-set mode) using the two sets of Y, M, C, and Bk band memories.Thereafter, the flow advances to step S672 to perform color printprocessing using the two sets of Y, M, C, and Bk band memories, thusending the processing.

If the vacant capacity of the RAM area is smaller than the constant M1,the flow advances to step S673 to select a record control mode (1-setmode) using one set of Y, M, C, and Bk band memories. Thereafter, theflow advances to step S674 to perform color print processing using oneset of Y, M, C, and Bk band memories, thus ending the processing.

As described above, one of the color print mode using one set of Y, M,C, and Bk band memories, and the color print mode using two sets of Y,M, C, and Bk band memories can be selected according to the vacantcapacity of the RAM area, and the color print processing can beperformed in the selected mode.

FIG. 132 is a flow chart showing jamming detection/recovery processingexecuted in step S6 and subsequent steps in FIG. 22, i.e., after pagedescription commands in units of pages are analyzed, and setting for thepath control table and formation of memory development information arecompleted.

In step S700, a jamming signal is detected, and the flow advances tostep S701 to check if jamming occurs.

If NO in step S701, the flow advances to step S702, and the controlwaits for a time α (msec) α is a constant!. If YES in step S701,recovery from jamming is detected in step S703. The flow then advancesto step S704 if recovery from jamming is completed.

If NO in step S704, the flow advances to step S705, and the controlwaits for a time β (msec) β is a constant!. Thereafter, the flow returnsto step S703.

If YES in step S704, the flow advances to step S706, and jammingrecovery processing is performed, thus ending processing.

FIGS. 133 and 134 are flow charts showing the jamming recoveryprocessing in step S706 in FIG. 132.

In step S710, 0 is set in a constant i, and the flow advances to stepS711.

In step S711, a pointer is set at the head of first memory developmentinformation (one set) stored in the memory development information area13, and the flow advances to step S712.

In step S712, the memory development information read in step S711 isanalyzed by the memory development analyzer 14 to develop theinformation onto the development memories (Y, M, C, and Bk bandmemories) corresponding to band i portions. Thereafter, the flowadvances to step S713.

If it is determined in step S713 that another memory developmentinformation remains, the flow advances to step S714, and the pointer isset at the head of the next memory development information (one set).Thereafter, the flow returns to step S712.

If no information remains, the flow advances to step S715.

In step S715, the contents of the memories developed in step S712 arecolor-printed by the output unit 19, and the flow advances to step S176.

In step S176, i is incremented by one, and the flow advances to stepS717.

In step S717, the Y, M, C, and Bk band memories are cleared, and theflow advances to step S718.

In step S718, the number of bands is compared with i. If a coincidenceis found between them, the processing is ended.

If no coincidence is found between them, the flow advances to step S719,drawing attributes temporarily retreated in the retreat areas of theattributes area 12 in step S6 in FIG. 22 are loaded, and are set in thevariable areas of attributes area 12. The flow then returns to stepS711.

The processing in step S712 is the same as that in step S12 in FIG. 23,and the processing in step S715 is the same as that in step S15 in FIG.23.

With the above-mentioned processing, jamming recovery processing can beperformed using the content of the path control table set at the time ofstep S6 in FIG. 22.

What is claimed is:
 1. An image processing method for receiving a codedrecord information in units of pages for use with a recording head,comprising the steps of:analyzing the received coded record informationto derive a minimum band number and a maximum band number of a band inwhich an object image represented by the coded record informationexists, the band having a height which is an integer multiple of aheight of the record head; storing the minimum band number and themaximum band number derived in the analyzing step for each object image;comparing the minimum band number and the maximum band number stored inthe storing step with a current band number to obtain a comparisonresult; and determining, in response to the comparison result obtainedin said comparing step, whether the object image is to be developed intodot data in the band.
 2. A method according to claim 1, furthercomprising the steps of:storing information of a specified area wherethe record information is recorded; checking upon development of therecord information into bit image data whether or not the bit image datais included in the specified area; and controlling operation so as notto develop the bit image data when the bit map data is not included inthe specified area.
 3. A method according to claim 1, further comprisingthe step of:controlling to perform jamming recovery processing whileholding a table information stored before detection of paper jam when itis detected that paper jam occurs during recording of the recordinformation.
 4. A method according to claim 1, further comprising thestep of:using an attribute information of an image to be drawn, theimage having been used in a previous page, in development of a currentpage when the image to be drawn is included in the previous page.
 5. Amethod according to claim 1, wherein said method is carried out in aprinter.
 6. A method according to claim 1, wherein the height of theband is determined to correspond to the height of the record head.
 7. Amethod according to claim 1, wherein the band in which a certain objectis drawn is obtained by dividing a start coordinate of the certainobject by the height of the band and by dividing an end coordinate ofthe certain object by the band height.
 8. A method according to claim 1,wherein the record information for each object comprises the minimumband number and the maximum band number.
 9. A method according to claim1, wherein the coded record information representing a certain objectincludes coordinates of a start point and an end point of the certainobject.
 10. A method according to claim 1, wherein the coded recordinformation is received from a host computer.
 11. A method according toclaim 1, further comprising the steps of:discriminating a storage areafor developing the record information into bit image data; anddetermining a development range based on a result of the discriminating.12. An image processing apparatus which receives a coded recordinformation in units of pages for use with a recording head,comprising:analyzing means for analyzing the received coded recordinformation to derive a minimum band number and a maximum band number ofa band in which an object image represented by the coded recordinformation exists, the band having a height which is an integermultiple of a height of the record head; storing means for storing theminimum band number and the maximum band number derived by saidanalyzing means for each object image; comparing means for comparing theminimum band number and the maximum band number stored in said storingmeans with a current band number to obtain a comparison result; anddetermining means for determining, in response to the comparison resultobtained by said comparing means, whether the object image is to bedeveloped into dot data in the band.
 13. An apparatus according to claim12, further comprising:discrimination means for discriminating a storagearea for developing the record information into bit image data; anddetermination means for determining a development range based on adiscrimination result.
 14. An apparatus according to claim 12, furthercomprising:storage means for storing information of a specified areawhere the record information is recorded; checking means for checkingupon development of the record information into bit image data whetheror not the bit image data is included in the specified area; and controlmeans for, controlling operation so as not to develop the bit image datawhen the bit image data is not included in the specified area.
 15. Anapparatus according to claim 12, further comprising control means forcontrolling to perform a jamming recovery processing while holdinginformation in a table before detection of a paper jam, when it isdetected that the paper jam occurs during recording of the recordinformation.
 16. An apparatus according to claim 12, further comprisingcontrol means for using an attribute information of an image, the imagehaving been included in a previous page, in development of a currentpage.
 17. An image processing apparatus according to claim 12, whereinsaid apparatus is a printer.
 18. An image processing apparatus accordingto claim 12, wherein the height of the band is determined to correspondto the height of the record head.
 19. An image processing apparatusaccording to claim 12, wherein the band in which a certain object isdrawn is obtained by dividing a start coordinate of the certain objectby the height of the band and by dividing an end coordinate of thecertain object by the band height.
 20. An image processing apparatusaccording to claim 12, wherein the record information for each objectcomprises the minimum band number and the maximum band number.
 21. Animage processing apparatus according to claim 12, wherein the codedrecord information representing a certain object includes coordinates ofa start point and an end point of the certain object.
 22. An imageprocessing apparatus according to claim 12, wherein the coded recordinformation is received from a host computer.
 23. A computer readablememory medium in which is stored a computer readable program to beexecuted by a computer to receive a coded record information in units ofpages for use with a recording head, the computer readable programcomprising the steps of:analyzing the received coded record informationto derive a minimum band number and a maximum band number of a band inwhich an object image represented by the coded record informationexists, the band having a height which is an integer multiple of aheight of the record head; storing the minimum band number and themaximum band number derived in the analyzing step for each object image;comparing the minimum band number and the maximum band number stored inthe storing step with a current band number to obtain a comparisonresult; and determining, in response to the comparison result obtainedin said comparing step, whether the object image is to be developed intodot data in the band.